diff --git a/.github/workflows/sync-fork.yml b/.github/workflows/sync-fork.yml
new file mode 100644
index 00000000000..ef524e26617
--- /dev/null
+++ b/.github/workflows/sync-fork.yml
@@ -0,0 +1,22 @@
+name: Sync Fork
+
+on:
+  schedule:
+    - cron: "0 */6 * * *"
+  workflow_dispatch:
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: main
+          fetch-depth: 0
+
+      - name: Sync upstream
+        run: |
+          git remote add upstream https://github.com/diegosouzapw/OmniRoute.git
+          git fetch upstream main
+          git merge upstream/main --no-edit
+          git push origin main
diff --git a/open-sse/services/combo.ts b/open-sse/services/combo.ts
index 02d6abfbd9c..03a6b46ab4e 100644
--- a/open-sse/services/combo.ts
+++ b/open-sse/services/combo.ts
@@ -65,7 +65,11 @@ const COMBO_BAD_REQUEST_FALLBACK_PATTERNS = [
 // Used to detect 503 responses from handleNoCredentials so combo can fallback.
 const ALL_ACCOUNTS_RATE_LIMITED_PATTERNS = [/unavailable/i, /service temporarily unavailable/i];
 
-function isAllAccountsRateLimitedResponse(status: number, contentType: string | null, errorText: string): boolean {
+function isAllAccountsRateLimitedResponse(
+  status: number,
+  contentType: string | null,
+  errorText: string
+): boolean {
   if (status !== 503) return false;
   if (!contentType?.includes("application/json")) return false;
   return ALL_ACCOUNTS_RATE_LIMITED_PATTERNS.some((p) => p.test(errorText));
@@ -168,7 +172,9 @@ async function validateResponseQuality(
   try {
     json = JSON.parse(text);
   } catch {
-    if (text.startsWith("data:")) return { valid: true };
+    if (text.startsWith("data:") || text.startsWith("event:") || text.includes("\ndata:")) {
+      return { valid: true };
+    }
     return { valid: false, reason: "response is not valid JSON" };
   }
 
@@ -1522,6 +1528,8 @@ export async function handleComboChat({
             target: toRecordedTarget(target),
           });
           recordedAttempts++;
+          if (!lastStatus) lastStatus = 422;
+          lastError = lastError || `quality check failed: ${quality.reason}`;
           if (i > 0) fallbackCount++;
           break; // move to next model
         }
@@ -1900,6 +1908,8 @@ async function handleRoundRobinCombo({
               target: toRecordedTarget(target),
             });
             recordedAttempts++;
+            if (!lastStatus) lastStatus = 422;
+            lastError = lastError || `quality check failed: ${quality.reason}`;
             if (offset > 0) fallbackCount++;
             break; // move to next model
           }
@@ -2001,7 +2011,10 @@ async function handleRoundRobinCombo({
         }
 
         if (isAllAccountsRateLimited) {
-          log.info("COMBO", `All accounts rate-limited for ${modelStr}, falling back to next model`);
+          log.info(
+            "COMBO",
+            `All accounts rate-limited for ${modelStr}, falling back to next model`
+          );
         } else if (!shouldFallback && !comboBadRequestFallback) {
           log.warn("COMBO-RR", `${modelStr} failed (no fallback)`, { status: result.status });
           recordComboRequest(combo.name, modelStr, {
diff --git a/tests/unit/combo-routing-engine.test.ts b/tests/unit/combo-routing-engine.test.ts
index 7e6bfdd19e2..fe5f86a7048 100644
--- a/tests/unit/combo-routing-engine.test.ts
+++ b/tests/unit/combo-routing-engine.test.ts
@@ -1927,3 +1927,97 @@ test("handleComboChat aborts combo when 503 response does NOT contain the unavai
       result.status === 503
   );
 });
+
+test("handleComboChat returns 422 (not ALL_ACCOUNTS_INACTIVE) when all models fail quality check", async () => {
+  const calls = [];
+
+  const result = await handleComboChat({
+    body: {},
+    combo: {
+      name: "quality-check-laststatus",
+      strategy: "priority",
+      models: ["model-a", "model-b"],
+      config: { maxRetries: 0 },
+    },
+    handleSingleModel: async (_body: any, modelStr: any) => {
+      calls.push(modelStr);
+      // Return 200 with invalid JSON — passes the ok check but fails validateResponseQuality
+      return new Response("{not valid json", {
+        status: 200,
+        headers: { "content-type": "text/plain" },
+      });
+    },
+    isModelAvailable: async () => true,
+    log: createLog(),
+    settings: null,
+    allCombos: null,
+    relayOptions: null,
+  });
+
+  const payload = await result.json();
+  // Before the fix: lastStatus was never set on quality-check failure path,
+  // so the code fell through to the `!lastStatus` branch returning ALL_ACCOUNTS_INACTIVE.
+  // After the fix: lastStatus is set to 422 and lastError is populated.
+  assert.equal(result.status, 422);
+  assert.ok(payload.error?.message?.includes("quality check failed"));
+  assert.deepEqual(calls, ["model-a", "model-b"]);
+});
+
+test("handleComboChat accepts SSE responses starting with event: line as valid", async () => {
+  const result = await handleComboChat({
+    body: {},
+    combo: {
+      name: "quality-sse-event-prefix",
+      strategy: "priority",
+      models: ["model-a"],
+      config: { maxRetries: 0 },
+    },
+    handleSingleModel: async () =>
+      new Response('event: message_start\ndata: {"type":"message_start"}\n\n', {
+        status: 200,
+        headers: { "content-type": "text/event-stream" },
+      }),
+    isModelAvailable: async () => true,
+    log: createLog(),
+    settings: null,
+    allCombos: null,
+    relayOptions: null,
+  });
+
+  // Before the fix: validateResponseQuality only checked text.startsWith("data:"),
+  // so SSE starting with "event:" was rejected as "response is not valid JSON".
+  // After the fix: text.startsWith("event:") and text.includes("\ndata:") also pass.
+  assert.equal(result.ok, true);
+});
+
+test("handleComboChat accepts SSE responses with event and data on separate lines", async () => {
+  const calls = [];
+  const result = await handleComboChat({
+    body: {},
+    combo: {
+      name: "quality-sse-newline-data",
+      strategy: "priority",
+      models: ["model-a", "model-b"],
+      config: { maxRetries: 0 },
+    },
+    handleSingleModel: async (_body: any, modelStr: any) => {
+      calls.push(modelStr);
+      if (modelStr === "model-a") {
+        // SSE with event: prefix before data: — Anthropic-style
+        return new Response(
+          'event: message_start\ndata: {"type":"message_start","message":{"id":"msg_1"}}\n\nevent: content_block_start\ndata: {"type":"content_block_start"}\n\n',
+          { status: 200, headers: { "content-type": "text/event-stream" } }
+        );
+      }
+      return okResponse();
+    },
+    isModelAvailable: async () => true,
+    log: createLog(),
+    settings: null,
+    allCombos: null,
+    relayOptions: null,
+  });
+
+  assert.equal(result.ok, true);
+  assert.deepEqual(calls, ["model-a"]);
+});