diff --git a/.changeset/giant-beans-wait.md b/.changeset/giant-beans-wait.md
new file mode 100644
index 000000000000..ccb8793e1d5c
--- /dev/null
+++ b/.changeset/giant-beans-wait.md
@@ -0,0 +1,7 @@
+---
+"ledger-live-desktop": patch
+"live-mobile": patch
+"@ledgerhq/trustchain": patch
+---
+
+Handle TrustchainAlreadyInitialized & TrustchainAlreadyInitializedWithOtherSeed on Scan QR
diff --git a/apps/ledger-live-desktop/src/newArch/features/WalletSync/hooks/useQRCode.ts b/apps/ledger-live-desktop/src/newArch/features/WalletSync/hooks/useQRCode.ts
index 01f853e3fce2..54bf875c2282 100644
--- a/apps/ledger-live-desktop/src/newArch/features/WalletSync/hooks/useQRCode.ts
+++ b/apps/ledger-live-desktop/src/newArch/features/WalletSync/hooks/useQRCode.ts
@@ -4,6 +4,7 @@ import {
   InvalidDigitsError,
   NoTrustchainInitialized,
   QRCodeWSClosed,
+  TrustchainAlreadyInitialized,
 } from "@ledgerhq/trustchain/errors";
 import { MemberCredentials } from "@ledgerhq/trustchain/types";
 import { useDispatch, useSelector } from "react-redux";
@@ -60,7 +61,7 @@ export function useQRCode() {
         },
         memberCredentials,
         memberName,
-        alreadyHasATrustchain: !!trustchain,
+        initialTrustchainId: trustchain?.rootId,
       }),
 
     // Don't use retry here because it always uses a delay despite setting it to 0
@@ -75,6 +76,9 @@ export function useQRCode() {
       if (e instanceof NoTrustchainInitialized) {
         dispatch(setFlow({ flow: Flow.Synchronize, step: Step.UnbackedError }));
       }
+      if (e instanceof TrustchainAlreadyInitialized) {
+        dispatch(setFlow({ flow: Flow.Synchronize, step: Step.SynchronizeWithQRCode }));
+      }
     },
 
     onSuccess(newTrustchain) {
diff --git a/apps/ledger-live-mobile/src/locales/en/common.json b/apps/ledger-live-mobile/src/locales/en/common.json
index 5aa346d19739..1d0e17e95129 100644
--- a/apps/ledger-live-mobile/src/locales/en/common.json
+++ b/apps/ledger-live-mobile/src/locales/en/common.json
@@ -6869,8 +6869,17 @@
         },
         "unbacked": {
           "title": "You need to create your encryption key first",
-          "desc": "Please make sure you’ve created an encryption key on one of your Ledger Live apps before continuing your synchronization.",
+          "description": "Please make sure you’ve created an encryption key on one of your Ledger Live apps before continuing your synchronization.",
           "cta": "Create your encryption key"
+        },
+        "backedWithDifferentSeeds": {
+          "title": "These apps have different backups",
+          "description": "Delete your encryption key from one of the apps and try again",
+          "cta": "I understand"
+        },
+        "alreadyBacked": {
+          "title": "These apps are already secured by a Ledger",
+          "cta": "I understand"
         }
       },
       "alreadySecureError": {
diff --git a/apps/ledger-live-mobile/src/newArch/features/Accounts/screens/AddAccount/components/StepFlow.tsx b/apps/ledger-live-mobile/src/newArch/features/Accounts/screens/AddAccount/components/StepFlow.tsx
index 5113dff3da12..d0e6b600d21d 100644
--- a/apps/ledger-live-mobile/src/newArch/features/Accounts/screens/AddAccount/components/StepFlow.tsx
+++ b/apps/ledger-live-mobile/src/newArch/features/Accounts/screens/AddAccount/components/StepFlow.tsx
@@ -11,7 +11,8 @@ import PinCodeDisplay from "LLM/features/WalletSync/screens/Synchronize/PinCodeD
 import PinCodeInput from "LLM/features/WalletSync/screens/Synchronize/PinCodeInput";
 import { useInitMemberCredentials } from "LLM/features/WalletSync/hooks/useInitMemberCredentials";
 import { useSyncWithQrCode } from "LLM/features/WalletSync/hooks/useSyncWithQrCode";
-import UnbackedError from "~/newArch/features/WalletSync/screens/Synchronize/UnbackedError";
+import { SpecificError } from "~/newArch/features/WalletSync/components/Error/SpecificError";
+import { ErrorReason } from "~/newArch/features/WalletSync/hooks/useSpecificError";
 
 type Props = {
   currentStep: Steps;
@@ -99,8 +100,23 @@ const StepFlow = ({
         return <SyncError tryAgain={navigateToQrCodeMethod} />;
 
       case Steps.UnbackedError:
-        return <UnbackedError create={onCreateKey} />;
+        return <SpecificError primaryAction={onCreateKey} error={ErrorReason.NO_BACKUP} />;
 
+      case Steps.AlreadyBacked:
+        return (
+          <SpecificError
+            primaryAction={() => setCurrentStep(Steps.QrCodeMethod)}
+            error={ErrorReason.ALREADY_BACKED_SCAN}
+          />
+        );
+
+      case Steps.BackedWithDifferentSeeds:
+        return (
+          <SpecificError
+            primaryAction={() => setCurrentStep(Steps.QrCodeMethod)}
+            error={ErrorReason.DIFFERENT_BACKUPS}
+          />
+        );
       default:
         return null;
     }
diff --git a/apps/ledger-live-mobile/src/newArch/features/Accounts/screens/AddAccount/useAddAccountViewModel.ts b/apps/ledger-live-mobile/src/newArch/features/Accounts/screens/AddAccount/useAddAccountViewModel.ts
index 0afdbb6c0dec..0f2ed84de879 100644
--- a/apps/ledger-live-mobile/src/newArch/features/Accounts/screens/AddAccount/useAddAccountViewModel.ts
+++ b/apps/ledger-live-mobile/src/newArch/features/Accounts/screens/AddAccount/useAddAccountViewModel.ts
@@ -3,11 +3,6 @@ import { track } from "~/analytics";
 import { useQRCodeHost } from "LLM/features/WalletSync/hooks/useQRCodeHost";
 import { Options, Steps } from "LLM/features/WalletSync/types/Activation";
 import { NavigatorName, ScreenName } from "~/const";
-import {
-  AnalyticsButton,
-  AnalyticsPage,
-  useLedgerSyncAnalytics,
-} from "~/newArch/features/WalletSync/hooks/useLedgerSyncAnalytics";
 import { useNavigation } from "@react-navigation/native";
 import { BaseComposite, StackNavigatorProps } from "~/components/RootNavigator/types/helpers";
 import { WalletSyncNavigatorStackParamList } from "~/components/RootNavigator/types/WalletSyncNavigator";
@@ -26,7 +21,6 @@ const startingStep = Steps.AddAccountMethod;
 const useAddAccountViewModel = ({ isOpened, onClose }: AddAccountDrawerProps) => {
   const [currentStep, setCurrentStep] = useState<Steps>(startingStep);
   const [currentOption, setCurrentOption] = useState<Options>(Options.SCAN);
-  const { onClickTrack } = useLedgerSyncAnalytics();
   const navigateToChooseSyncMethod = () => setCurrentStep(Steps.ChooseSyncMethod);
   const navigateToQrCodeMethod = () => setCurrentStep(Steps.QrCodeMethod);
   const navigation = useNavigation<NavigationProps["navigation"]>();
@@ -68,7 +62,6 @@ const useAddAccountViewModel = ({ isOpened, onClose }: AddAccountDrawerProps) =>
   });
 
   const onCreateKey = () => {
-    onClickTrack({ button: AnalyticsButton.CreateYourKey, page: AnalyticsPage.Unbacked });
     navigation.navigate(NavigatorName.WalletSync, {
       screen: ScreenName.WalletSyncActivationProcess,
     });
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Activation/ActivationFlow.tsx b/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Activation/ActivationFlow.tsx
index 59cf1eaa9ece..f45c01ec6e11 100644
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Activation/ActivationFlow.tsx
+++ b/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Activation/ActivationFlow.tsx
@@ -10,7 +10,8 @@ import PinCodeInput from "../../screens/Synchronize/PinCodeInput";
 import SyncError from "../../screens/Synchronize/SyncError";
 import { useInitMemberCredentials } from "../../hooks/useInitMemberCredentials";
 import { useSyncWithQrCode } from "../../hooks/useSyncWithQrCode";
-import UnbackedError from "../../screens/Synchronize/UnbackedError";
+import { SpecificError } from "../Error/SpecificError";
+import { ErrorReason } from "../../hooks/useSpecificError";
 
 type Props = {
   currentStep: Steps;
@@ -91,7 +92,23 @@ const ActivationFlow = ({
         return <SyncError tryAgain={navigateToQrCodeMethod} />;
 
       case Steps.UnbackedError:
-        return <UnbackedError create={onCreateKey} />;
+        return <SpecificError primaryAction={onCreateKey} error={ErrorReason.NO_BACKUP} />;
+
+      case Steps.AlreadyBacked:
+        return (
+          <SpecificError
+            primaryAction={() => setCurrentStep(Steps.QrCodeMethod)}
+            error={ErrorReason.ALREADY_BACKED_SCAN}
+          />
+        );
+
+      case Steps.BackedWithDifferentSeeds:
+        return (
+          <SpecificError
+            primaryAction={() => setCurrentStep(Steps.QrCodeMethod)}
+            error={ErrorReason.DIFFERENT_BACKUPS}
+          />
+        );
       default:
         return null;
     }
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Error/Detailed.tsx b/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Error/Detailed.tsx
index fa86c64c27c8..ccca7cb91ac2 100644
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Error/Detailed.tsx
+++ b/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Error/Detailed.tsx
@@ -8,7 +8,7 @@ import styled from "styled-components/native";
 interface Props {
   icon: React.ReactNode;
   title: string;
-  description: string;
+  description?: string;
   info?: string;
   cta: string;
   ctaSecondary?: string;
@@ -42,24 +42,29 @@ export function DetailedError(props: Props) {
       </Text>
 
       <Flex flexDirection="column" mb={8} rowGap={16}>
-        <Text variant="bodyLineHeight" color="neutral.c70" textAlign="center">
-          {description}
-        </Text>
-        <Text variant="bodyLineHeight" color="neutral.c70" textAlign="center">
-          {info}
-        </Text>
+        {description && (
+          <Text variant="bodyLineHeight" color="neutral.c70" textAlign="center">
+            {description}
+          </Text>
+        )}
+        {info && (
+          <Text variant="bodyLineHeight" color="neutral.c70" textAlign="center">
+            {info}
+          </Text>
+        )}
       </Flex>
 
       <Flex flexDirection="column" rowGap={24} mb={6} width={"100%"} px={"16px"}>
         <Button type={buttonType} outline={outline} onPress={primaryAction}>
           {cta}
         </Button>
-
-        <Link onPress={secondaryAction}>
-          <Text variant="paragraph" fontWeight="semiBold" color="neutral.c70">
-            {ctaSecondary}
-          </Text>
-        </Link>
+        {ctaSecondary && secondaryAction && (
+          <Link onPress={secondaryAction}>
+            <Text variant="paragraph" fontWeight="semiBold" color="neutral.c70">
+              {ctaSecondary}
+            </Text>
+          </Link>
+        )}
       </Flex>
     </Flex>
   );
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Error/Simple.tsx b/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Error/Simple.tsx
index 0e0820a280fb..aba928734e22 100644
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Error/Simple.tsx
+++ b/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Error/Simple.tsx
@@ -3,7 +3,7 @@ import React from "react";
 import styled, { useTheme } from "styled-components/native";
 type Props = {
   title: string;
-  desc: string;
+  desc?: string;
   mainButton: {
     label: string;
     onPress: () => void;
@@ -22,9 +22,11 @@ export function ErrorComponent({ title, desc, mainButton }: Props) {
         <Text variant="h4" color="neutral.c100" textAlign="center" fontWeight="semiBold" mt={7}>
           {title}
         </Text>
-        <Text variant="bodyLineHeight" color="neutral.c70" textAlign="center" mt={6}>
-          {desc}
-        </Text>
+        {desc && (
+          <Text variant="bodyLineHeight" color="neutral.c70" textAlign="center" mt={6}>
+            {desc}
+          </Text>
+        )}
       </Flex>
       <Flex mt={8}>
         <Button type="main" outline={mainButton.outline} onPress={mainButton.onPress}>
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Error/SpecificError.tsx b/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Error/SpecificError.tsx
index 4e039734d1ed..a9c8f6cb4c90 100644
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Error/SpecificError.tsx
+++ b/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/Error/SpecificError.tsx
@@ -1,17 +1,15 @@
 import React from "react";
-import { ErrorReason, useSpecificError } from "../../hooks/useSpecificError";
+import { ErrorReason, SpecificProps, useSpecificError } from "../../hooks/useSpecificError";
 import { DetailedError } from "./Detailed";
 
-type Props = {
+export const SpecificError = ({
+  error,
+  primaryAction,
+  secondaryAction,
+}: SpecificProps & {
   error: ErrorReason;
-  cancel?: () => void;
-  understood?: () => void;
-  goToDelete?: () => void;
-  tryAgain?: () => void;
-};
-
-export const SpecificError = ({ error, cancel, goToDelete, understood, tryAgain }: Props) => {
-  const { getErrorConfig } = useSpecificError({ cancel, goToDelete, understood, tryAgain });
+}) => {
+  const { getErrorConfig } = useSpecificError({ primaryAction, secondaryAction });
   const config = getErrorConfig(error);
 
   return <DetailedError {...config} />;
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/ManageInstances/DeletionError.tsx b/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/ManageInstances/DeletionError.tsx
index 486151cccddd..86d31193acc0 100644
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/ManageInstances/DeletionError.tsx
+++ b/apps/ledger-live-mobile/src/newArch/features/WalletSync/components/ManageInstances/DeletionError.tsx
@@ -1,12 +1,9 @@
 import React from "react";
-import { ErrorReason } from "../../hooks/useSpecificError";
+import { ErrorReason, SpecificProps } from "../../hooks/useSpecificError";
 import { SpecificError } from "../Error/SpecificError";
 
-type Props = {
+type Props = SpecificProps & {
   error: ErrorReason;
-  tryAgain?: () => void;
-  understood?: () => void;
-  goToDelete?: () => void;
 };
 
 export const DeletionError = (props: Props) => {
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useLedgerSyncAnalytics.ts b/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useLedgerSyncAnalytics.ts
index 35aff54a2dea..368654a35246 100644
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useLedgerSyncAnalytics.ts
+++ b/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useLedgerSyncAnalytics.ts
@@ -22,6 +22,8 @@ export enum AnalyticsPage {
   Unbacked = "Unbacked",
   OtherSeed = "Other seed",
   SameSeed = "Same seed",
+  ScanAttemptWithSameBackup = "Scan attempt with same backup",
+  ScanAttemptWithDifferentBackups = "Scan attempt with different backups",
 }
 
 export enum AnalyticsFlow {
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useQRCodeHost.ts b/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useQRCodeHost.ts
index dc89156d7541..64475771ac4b 100644
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useQRCodeHost.ts
+++ b/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useQRCodeHost.ts
@@ -68,7 +68,7 @@ export function useQRCodeHost({ setCurrentStep, currentStep, currentOption }: Pr
         },
         memberCredentials,
         memberName,
-        alreadyHasATrustchain: !!trustchain,
+        initialTrustchainId: trustchain?.rootId,
       }),
 
     onSuccess: newTrustchain => {
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useSpecificError.tsx b/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useSpecificError.tsx
index baf5748ecb08..1718a7994d44 100644
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useSpecificError.tsx
+++ b/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useSpecificError.tsx
@@ -11,12 +11,15 @@ export enum ErrorReason {
   AUTO_REMOVE = "auto-remove",
   SAME_SEED = "same",
   OTHER_SEED = "other",
+  ALREADY_BACKED_SCAN = "already-backed",
+  DIFFERENT_BACKUPS = "different-backups",
+  NO_BACKUP = "no-backup",
 }
 
 export interface ErrorConfig {
   icon: React.ReactNode;
   title: string;
-  description: string;
+  description?: string;
   info?: string;
   cta: string;
   ctaSecondary?: string;
@@ -27,37 +30,35 @@ export interface ErrorConfig {
   secondaryAction?: () => void;
 }
 
-type Props = {
-  tryAgain?: () => void;
-  understood?: () => void;
-  goToDelete?: () => void;
-  cancel?: () => void;
+export type SpecificProps = {
+  primaryAction: () => void;
+  secondaryAction?: () => void;
 };
 
-export function useSpecificError({ tryAgain, understood, goToDelete, cancel }: Props) {
+export function useSpecificError({ primaryAction, secondaryAction }: SpecificProps) {
   const { onClickTrack } = useLedgerSyncAnalytics();
   const { t } = useTranslation();
   const { colors } = useTheme();
 
   const onTryAgain = (page: AnalyticsPage) => {
-    tryAgain?.();
     onClickTrack({ button: AnalyticsButton.UseAnother, page });
   };
   const onGoToDelete = (page: AnalyticsPage) => {
-    goToDelete?.();
     onClickTrack({ button: AnalyticsButton.DeleteKey, page });
   };
 
   const onUnderstood = (page: AnalyticsPage) => {
-    understood?.();
     onClickTrack({ button: AnalyticsButton.Understand, page });
   };
 
   const onCancel = (page: AnalyticsPage) => {
-    cancel?.();
     onClickTrack({ button: AnalyticsButton.Cancel, page });
   };
 
+  const onCreate = (page: AnalyticsPage) => {
+    onClickTrack({ button: AnalyticsButton.CreateYourKey, page });
+  };
+
   const errorConfig: Record<ErrorReason, ErrorConfig> = {
     [ErrorReason.UNSECURED]: {
       icon: <Icons.DeleteCircleFill size={"L"} color={colors.error.c60} />,
@@ -72,8 +73,14 @@ export function useSpecificError({ tryAgain, understood, goToDelete, cancel }: P
       ),
       analyticsPage: AnalyticsPage.RemoveInstanceWrongDevice,
       buttonType: "main" as ButtonProps["type"],
-      primaryAction: () => onTryAgain(AnalyticsPage.RemoveInstanceWrongDevice),
-      secondaryAction: () => onGoToDelete(AnalyticsPage.RemoveInstanceWrongDevice),
+      primaryAction: () => {
+        primaryAction();
+        onTryAgain(AnalyticsPage.RemoveInstanceWrongDevice);
+      },
+      secondaryAction: () => {
+        secondaryAction?.();
+        onGoToDelete(AnalyticsPage.RemoveInstanceWrongDevice);
+      },
     },
     [ErrorReason.AUTO_REMOVE]: {
       icon: <Icons.InformationFill size={"L"} color={colors.primary.c80} />,
@@ -88,8 +95,14 @@ export function useSpecificError({ tryAgain, understood, goToDelete, cancel }: P
       ),
       analyticsPage: AnalyticsPage.AutoRemove,
       buttonType: "main" as ButtonProps["type"],
-      primaryAction: () => onUnderstood(AnalyticsPage.AutoRemove),
-      secondaryAction: () => onGoToDelete(AnalyticsPage.AutoRemove),
+      primaryAction: () => {
+        primaryAction();
+        onUnderstood(AnalyticsPage.AutoRemove);
+      },
+      secondaryAction: () => {
+        secondaryAction?.();
+        onGoToDelete(AnalyticsPage.AutoRemove);
+      },
     },
     [ErrorReason.SAME_SEED]: {
       icon: <Icons.InformationFill size={"L"} color={colors.primary.c80} />,
@@ -99,20 +112,65 @@ export function useSpecificError({ tryAgain, understood, goToDelete, cancel }: P
 
       analyticsPage: AnalyticsPage.SameSeed,
       buttonType: "main" as ButtonProps["type"],
-      primaryAction: () => onUnderstood(AnalyticsPage.SameSeed),
+      primaryAction: () => {
+        primaryAction();
+        onUnderstood(AnalyticsPage.SameSeed);
+      },
     },
     [ErrorReason.OTHER_SEED]: {
       icon: <Icons.DeleteCircleFill size={"L"} color={colors.error.c60} />,
       title: t("walletSync.synchronize.alreadySecureOtherSeedError.title"),
       description: t("walletSync.synchronize.alreadySecureOtherSeedError.description"),
-
       cta: t("walletSync.synchronize.alreadySecureOtherSeedError.cta"),
       ctaSecondary: t("common.cancel"),
       analyticsPage: AnalyticsPage.OtherSeed,
       buttonType: "main" as ButtonProps["type"],
       outline: true,
-      primaryAction: () => onGoToDelete(AnalyticsPage.OtherSeed),
-      secondaryAction: () => onCancel(AnalyticsPage.OtherSeed),
+      primaryAction: () => {
+        primaryAction();
+        onGoToDelete(AnalyticsPage.OtherSeed);
+      },
+      secondaryAction: () => {
+        secondaryAction?.();
+        onCancel(AnalyticsPage.OtherSeed);
+      },
+    },
+    [ErrorReason.ALREADY_BACKED_SCAN]: {
+      icon: <Icons.InformationFill size={"L"} color={colors.primary.c80} />,
+      title: t("walletSync.synchronize.qrCode.alreadyBacked.title"),
+      cta: t("walletSync.synchronize.qrCode.alreadyBacked.cta"),
+      analyticsPage: AnalyticsPage.ScanAttemptWithSameBackup,
+      buttonType: "main" as ButtonProps["type"],
+      primaryAction: () => {
+        primaryAction();
+        onUnderstood(AnalyticsPage.ScanAttemptWithSameBackup);
+      },
+    },
+    [ErrorReason.DIFFERENT_BACKUPS]: {
+      icon: <Icons.DeleteCircleFill size={"L"} color={colors.error.c60} />,
+      title: t("walletSync.synchronize.qrCode.backedWithDifferentSeeds.title"),
+      description: t("walletSync.synchronize.qrCode.backedWithDifferentSeeds.description"),
+      cta: t("walletSync.synchronize.qrCode.backedWithDifferentSeeds.cta"),
+      analyticsPage: AnalyticsPage.ScanAttemptWithDifferentBackups,
+      buttonType: "main" as ButtonProps["type"],
+
+      primaryAction: () => {
+        primaryAction();
+        onGoToDelete(AnalyticsPage.ScanAttemptWithDifferentBackups);
+      },
+    },
+    [ErrorReason.NO_BACKUP]: {
+      icon: <Icons.DeleteCircleFill size={"L"} color={colors.error.c60} />,
+      title: t("walletSync.synchronize.qrCode.unbacked.title"),
+      description: t("walletSync.synchronize.qrCode.unbacked.description"),
+      cta: t("walletSync.synchronize.qrCode.unbacked.cta"),
+      analyticsPage: AnalyticsPage.Unbacked,
+      buttonType: "main" as ButtonProps["type"],
+
+      primaryAction: () => {
+        primaryAction();
+        onCreate(AnalyticsPage.Unbacked);
+      },
     },
   };
 
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useSyncWithQrCode.ts b/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useSyncWithQrCode.ts
index 475eb22f71e4..b116cb0e6cda 100644
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useSyncWithQrCode.ts
+++ b/apps/ledger-live-mobile/src/newArch/features/WalletSync/hooks/useSyncWithQrCode.ts
@@ -1,7 +1,12 @@
 import { useCallback, useState } from "react";
 import { MemberCredentials, TrustchainMember } from "@ledgerhq/trustchain/types";
 import { createQRCodeCandidateInstance } from "@ledgerhq/trustchain/qrcode/index";
-import { InvalidDigitsError, NoTrustchainInitialized } from "@ledgerhq/trustchain/errors";
+import {
+  InvalidDigitsError,
+  NoTrustchainInitialized,
+  TrustchainAlreadyInitialized,
+  TrustchainAlreadyInitializedWithOtherSeed,
+} from "@ledgerhq/trustchain/errors";
 import { setTrustchain, trustchainSelector } from "@ledgerhq/trustchain/store";
 import { useDispatch, useSelector } from "react-redux";
 import { useNavigation } from "@react-navigation/native";
@@ -61,7 +66,7 @@ export const useSyncWithQrCode = () => {
             }
             throw new NoTrustchainInitialized();
           },
-          alreadyHasATrustchain: !!trustchain,
+          initialTrustchainId: trustchain?.rootId,
         });
         if (newTrustchain) {
           dispatch(setTrustchain(newTrustchain));
@@ -75,6 +80,16 @@ export const useSyncWithQrCode = () => {
         } else if (e instanceof NoTrustchainInitialized) {
           setCurrentStep(Steps.UnbackedError);
           return;
+        } else if (e instanceof TrustchainAlreadyInitialized) {
+          if (e.message === trustchain?.rootId) {
+            setCurrentStep(Steps.AlreadyBacked);
+          } else {
+            setCurrentStep(Steps.BackedWithDifferentSeeds);
+          }
+          return;
+        } else if (e instanceof TrustchainAlreadyInitializedWithOtherSeed) {
+          setCurrentStep(Steps.BackedWithDifferentSeeds);
+          return;
         }
         throw e;
       }
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/Activation/useActivationDrawerModel.ts b/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/Activation/useActivationDrawerModel.ts
index a11d1842401c..635a6cdcb374 100644
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/Activation/useActivationDrawerModel.ts
+++ b/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/Activation/useActivationDrawerModel.ts
@@ -70,7 +70,6 @@ const useActivationDrawerModel = ({ isOpen, startingStep, handleClose }: Props)
   };
 
   const onCreateKey = () => {
-    onClickTrack({ button: AnalyticsButton.CreateYourKey, page: AnalyticsPage.Unbacked });
     navigation.navigate(NavigatorName.WalletSync, {
       screen: ScreenName.WalletSyncActivationProcess,
     });
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/FollowInstructions/index.tsx b/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/FollowInstructions/index.tsx
index ddffbef0c8e5..41a043e6dee5 100644
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/FollowInstructions/index.tsx
+++ b/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/FollowInstructions/index.tsx
@@ -43,20 +43,20 @@ const GenericFollowInstructionsDrawer = ({
         return (
           <DeletionError
             error={ErrorReason.UNSECURED}
-            tryAgain={handleClose}
-            goToDelete={goToDelete}
+            primaryAction={handleClose}
+            secondaryAction={goToDelete}
           />
         );
 
       case SceneKind.AlreadySecuredSameSeed:
-        return <SpecificError error={ErrorReason.SAME_SEED} understood={handleClose} />;
+        return <SpecificError error={ErrorReason.SAME_SEED} primaryAction={handleClose} />;
 
       case SceneKind.AlreadySecuredOtherSeed:
         return (
           <SpecificError
             error={ErrorReason.OTHER_SEED}
-            cancel={handleClose}
-            goToDelete={goToDelete}
+            secondaryAction={handleClose}
+            primaryAction={goToDelete}
           />
         );
 
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/ManageInstances/ManageInstancesDrawer.tsx b/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/ManageInstances/ManageInstancesDrawer.tsx
index 04bb01f61e25..767b6f4465bd 100644
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/ManageInstances/ManageInstancesDrawer.tsx
+++ b/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/ManageInstances/ManageInstancesDrawer.tsx
@@ -9,11 +9,6 @@ import { DeletionError } from "../../components/ManageInstances/DeletionError";
 
 import { HookResult, Scene } from "./useManageInstanceDrawer";
 import { useManageKeyDrawer } from "../ManageKey/useManageKeyDrawer";
-import {
-  AnalyticsButton,
-  AnalyticsPage,
-  useLedgerSyncAnalytics,
-} from "../../hooks/useLedgerSyncAnalytics";
 import { ErrorReason } from "../../hooks/useSpecificError";
 
 const ManageInstancesDrawer = ({
@@ -27,13 +22,11 @@ const ManageInstancesDrawer = ({
 }: HookResult) => {
   const { error, isError, isLoading, data } = memberHook;
   const manageKeyHook = useManageKeyDrawer();
-  const { onClickTrack } = useLedgerSyncAnalytics();
 
   const goToManageBackup = useCallback(() => {
     handleClose();
     manageKeyHook.openDrawer();
-    onClickTrack({ button: AnalyticsButton.ManageKey, page: AnalyticsPage.AutoRemove });
-  }, [manageKeyHook, onClickTrack, handleClose]);
+  }, [manageKeyHook, handleClose]);
 
   const getScene = () => {
     if (isError) {
@@ -62,8 +55,8 @@ const ManageInstancesDrawer = ({
       return (
         <DeletionError
           error={ErrorReason.AUTO_REMOVE}
-          goToDelete={goToManageBackup}
-          understood={() => changeScene(Scene.List)}
+          primaryAction={() => changeScene(Scene.List)}
+          secondaryAction={goToManageBackup}
         />
       );
     }
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/Synchronize/UnbackedError.tsx b/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/Synchronize/UnbackedError.tsx
deleted file mode 100644
index bccb4b3a6711..000000000000
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/screens/Synchronize/UnbackedError.tsx
+++ /dev/null
@@ -1,22 +0,0 @@
-import React from "react";
-import { useTranslation } from "react-i18next";
-import { ErrorComponent } from "../../components/Error/Simple";
-
-interface Props {
-  create: () => void;
-}
-
-export default function UnbackedError({ create }: Props) {
-  const { t } = useTranslation();
-  return (
-    <ErrorComponent
-      title={t("walletSync.synchronize.qrCode.unbacked.title")}
-      desc={t("walletSync.synchronize.qrCode.unbacked.desc")}
-      mainButton={{
-        label: t("walletSync.synchronize.qrCode.unbacked.cta"),
-        onPress: create,
-        outline: false,
-      }}
-    />
-  );
-}
diff --git a/apps/ledger-live-mobile/src/newArch/features/WalletSync/types/Activation.ts b/apps/ledger-live-mobile/src/newArch/features/WalletSync/types/Activation.ts
index 563db584c53b..1e09b07d4929 100644
--- a/apps/ledger-live-mobile/src/newArch/features/WalletSync/types/Activation.ts
+++ b/apps/ledger-live-mobile/src/newArch/features/WalletSync/types/Activation.ts
@@ -15,4 +15,6 @@ export enum Steps {
   PinInput = "PinInput",
   SyncError = "SyncError",
   UnbackedError = "UnbackedError",
+  AlreadyBacked = "AlreadyBacked",
+  BackedWithDifferentSeeds = "BackedWithDifferentSeeds",
 }
diff --git a/apps/web-tools/trustchain/components/AppQRCodeCandidate.tsx b/apps/web-tools/trustchain/components/AppQRCodeCandidate.tsx
index 2e749fed5dce..d1053f74d621 100644
--- a/apps/web-tools/trustchain/components/AppQRCodeCandidate.tsx
+++ b/apps/web-tools/trustchain/components/AppQRCodeCandidate.tsx
@@ -44,7 +44,7 @@ export function AppQRCodeCandidate({
           }
           throw new NoTrustchainInitialized();
         },
-        alreadyHasATrustchain: !!trustchain,
+        initialTrustchainId: trustchain?.rootId,
       })
         .then(trustchain => {
           if (trustchain) {
diff --git a/apps/web-tools/trustchain/components/AppQRCodeHost.tsx b/apps/web-tools/trustchain/components/AppQRCodeHost.tsx
index 29fa9747c355..cbfb3ce6b820 100644
--- a/apps/web-tools/trustchain/components/AppQRCodeHost.tsx
+++ b/apps/web-tools/trustchain/components/AppQRCodeHost.tsx
@@ -38,7 +38,7 @@ export function AppQRCodeHost({
       },
       memberCredentials,
       memberName: "WebTools",
-      alreadyHasATrustchain: !!trustchain,
+      initialTrustchainId: trustchain.rootId,
     })
       .catch(e => {
         if (e instanceof InvalidDigitsError) {
diff --git a/libs/trustchain/src/qrcode/index.test.ts b/libs/trustchain/src/qrcode/index.test.ts
index 2861b0e3bcf9..afb0e087ea49 100644
--- a/libs/trustchain/src/qrcode/index.test.ts
+++ b/libs/trustchain/src/qrcode/index.test.ts
@@ -59,7 +59,7 @@ describe("Trustchain QR Code", () => {
       addMember,
       memberCredentials,
       memberName,
-      alreadyHasATrustchain: !!trustchain,
+      initialTrustchainId: trustchain.rootId,
     });
 
     const scannedUrl = await scannedUrlPromise;
@@ -67,7 +67,7 @@ describe("Trustchain QR Code", () => {
     const candidateP = createQRCodeCandidateInstance({
       memberCredentials,
       memberName,
-      alreadyHasATrustchain: false,
+      initialTrustchainId: undefined,
       addMember,
       scannedUrl,
       onRequestQRCodeInput,
diff --git a/libs/trustchain/src/qrcode/index.ts b/libs/trustchain/src/qrcode/index.ts
index 8ea49ec2e9fd..008f1369fddf 100644
--- a/libs/trustchain/src/qrcode/index.ts
+++ b/libs/trustchain/src/qrcode/index.ts
@@ -27,11 +27,11 @@ const commonSwitch = async ({
   reject,
   ws,
   setFinished,
-  alreadyHasATrustchain,
+  initialTrustchainId,
 }) => {
   switch (data.message) {
     case "TrustchainShareCredential": {
-      if (!alreadyHasATrustchain) {
+      if (!initialTrustchainId) {
         const payload = {
           type: "UNEXPECTED_SHARE_CREDENTIAL",
           message: "unexpected share credential",
@@ -52,13 +52,13 @@ const commonSwitch = async ({
     }
 
     case "TrustchainRequestCredential": {
-      if (alreadyHasATrustchain) {
+      if (initialTrustchainId) {
         const payload = {
           type: "UNEXPECTED_REQUEST_CREDENTIAL",
-          message: "unexpected request credential",
+          message: initialTrustchainId,
         };
         send({ version, publisher, message: "Failure", payload });
-        throw new TrustchainAlreadyInitialized("unexpected request credential");
+        throw new TrustchainAlreadyInitialized(initialTrustchainId);
       }
       const payload = await cipher.encryptMessagePayload({
         id: memberCredentials.pubkey,
@@ -103,7 +103,7 @@ export async function createQRCodeHostInstance({
   addMember,
   memberCredentials,
   memberName,
-  alreadyHasATrustchain,
+  initialTrustchainId,
 }: {
   /**
    * the base URL of the trustchain API
@@ -130,9 +130,9 @@ export async function createQRCodeHostInstance({
    */
   memberName: string;
   /**
-   * if the member already has a trustchain, this will be true
+   * if the member already has a trustchain, this will be defined
    */
-  alreadyHasATrustchain: boolean;
+  initialTrustchainId?: string;
 }): Promise<Trustchain | void> {
   const ephemeralKey = await crypto.randomKeypair();
   const publisher = crypto.to_hex(ephemeralKey.publicKey);
@@ -210,7 +210,7 @@ export async function createQRCodeHostInstance({
           reject,
           ws,
           setFinished,
-          alreadyHasATrustchain,
+          initialTrustchainId,
         });
       } catch (e) {
         console.error("socket error", e);
@@ -229,7 +229,7 @@ export async function createQRCodeCandidateInstance({
   memberCredentials,
   memberName,
   addMember,
-  alreadyHasATrustchain,
+  initialTrustchainId,
   scannedUrl,
   onRequestQRCodeInput,
 }: {
@@ -242,9 +242,9 @@ export async function createQRCodeCandidateInstance({
    */
   memberName: string;
   /**
-   * if the member already has a trustchain, this will be true
+   * if the member already has a trustchain, this will be defined
    */
-  alreadyHasATrustchain: boolean;
+  initialTrustchainId?: string;
   /**
    * this function will need to using the TrustchainSDK (and use sdk.addMember)
    */
@@ -302,7 +302,7 @@ export async function createQRCodeCandidateInstance({
             break;
           }
           case "HandshakeCompletionSucceeded": {
-            if (alreadyHasATrustchain) {
+            if (initialTrustchainId) {
               const payload = await cipher.encryptMessagePayload({});
               send({ version, publisher, message: "TrustchainRequestCredential", payload });
             } else {
@@ -327,7 +327,7 @@ export async function createQRCodeCandidateInstance({
           reject,
           ws,
           setFinished,
-          alreadyHasATrustchain,
+          initialTrustchainId,
         });
       } catch (e) {
         console.error("socket error", e);