diff --git a/src/apps/monero/protocol/tsx_sign_builder.py b/src/apps/monero/protocol/tsx_sign_builder.py
index 466081b3a..5b503b325 100644
--- a/src/apps/monero/protocol/tsx_sign_builder.py
+++ b/src/apps/monero/protocol/tsx_sign_builder.py
@@ -562,7 +562,6 @@ async def set_input(self, src_entr):
         pseudo_out = None
         pseudo_out_hmac = None
         alpha_enc = None
-        spend_enc = None
 
         if self.use_simple_rct:
             alpha, pseudo_out = self._gen_commitment(src_entr.amount)
@@ -896,7 +895,7 @@ def _range_proof(self, idx, amount, rsig_data=None):
             self.output_masks = []
         return rsig, mask
 
-    def _set_out1_ecdh(self, idx, dest_pub_key, amount, mask, amount_key):
+    def _set_out1_ecdh(self, dest_pub_key, amount, mask, amount_key):
         from apps.monero.xmr import ring_ct
 
         # Mask sum
@@ -1046,7 +1045,6 @@ async def set_out1(self, dst_entr, dst_entr_hmac, rsig_data=None):
 
         # Out_pk, ecdh_info
         out_pk, ecdh_info_bin = self._set_out1_ecdh(
-            self.out_idx,
             dest_pub_key=tx_out_key,
             amount=dst_entr.amount,
             mask=mask,
@@ -1331,7 +1329,6 @@ async def sign_input(
         gc.collect()
         from apps.monero.xmr import mlsag2
 
-        mg = None
         if self.use_simple_rct:
             # Simple RingCT
             mix_ring = [x.key for x in src_entr.outputs]
diff --git a/src/apps/monero/xmr/mlsag2.py b/src/apps/monero/xmr/mlsag2.py
index ef8d0ca00..14bdd33c9 100644
--- a/src/apps/monero/xmr/mlsag2.py
+++ b/src/apps/monero/xmr/mlsag2.py
@@ -23,7 +23,7 @@ def scalar_gen_vector(n):
     """
     Generates vector of scalars
     """
-    return [crypto.random_scalar() for i in range(0, n)]
+    return [crypto.random_scalar() for _ in range(0, n)]
 
 
 #
diff --git a/src/apps/monero/xmr/monero.py b/src/apps/monero/xmr/monero.py
index ac7c50851..b3351ccd7 100644
--- a/src/apps/monero/xmr/monero.py
+++ b/src/apps/monero/xmr/monero.py
@@ -123,7 +123,6 @@ def generate_tx_spend_and_key_image(
 
     # step 2: add Hs(SubAddr || a || index_major || index_minor)
     subaddr_sk = None
-    scalar_step2 = None
     if received_index == (0, 0):
         scalar_step2 = scalar_step1
     else:
diff --git a/src/apps/monero/xmr/ring_ct.py b/src/apps/monero/xmr/ring_ct.py
index f77c3a58b..8294d16a3 100644
--- a/src/apps/monero/xmr/ring_ct.py
+++ b/src/apps/monero/xmr/ring_ct.py
@@ -6,15 +6,6 @@
 from apps.monero.xmr import crypto
 
 
-def bp_size(outputs):
-    M, logM = 1, 0
-    while M <= 16 and M < outputs:
-        logM += 1
-        M = 1 << logM
-
-    return 32 * (21 + outputs + 2 * logM)
-
-
 def prove_range_bp(amount, last_mask=None):
     mask = last_mask if last_mask is not None else crypto.random_scalar()
     bp_proof = prove_range_bp_batch([amount], [mask])
diff --git a/src/apps/monero/xmr/sub/recode.py b/src/apps/monero/xmr/sub/recode.py
index b0cc22c13..7ebfa57dd 100644
--- a/src/apps/monero/xmr/sub/recode.py
+++ b/src/apps/monero/xmr/sub/recode.py
@@ -22,7 +22,7 @@ def recode_ecdh(ecdh, encode=True):
 def recode_msg(mgs, encode=True):
     """
     Recodes MGs signatures from raw forms to bytearrays so it works with serialization
-    :param rv:
+    :param mgs:
     :param encode: if true encodes to byte representation, otherwise decodes from byte representation
     :return:
     """