diff --git a/core/src/apps/cardano/layout.py b/core/src/apps/cardano/layout.py
index 8adb37072..005ede1b7 100644
--- a/core/src/apps/cardano/layout.py
+++ b/core/src/apps/cardano/layout.py
@@ -75,10 +75,6 @@ def format_coin_amount(amount: int, network_id: int) -> str:
     return f"{format_amount(amount, 6)} {currency}"
 
 
-def is_printable_ascii_bytestring(bytestr: bytes) -> bool:
-    return all((32 < b < 127) for b in bytestr)
-
-
 async def show_native_script(
     ctx: wire.Context,
     script: messages.CardanoNativeScript,
diff --git a/core/src/apps/cardano/sign_tx/plutus_signer.py b/core/src/apps/cardano/sign_tx/plutus_signer.py
index bbb769aef..2908561d9 100644
--- a/core/src/apps/cardano/sign_tx/plutus_signer.py
+++ b/core/src/apps/cardano/sign_tx/plutus_signer.py
@@ -45,12 +45,6 @@ class PlutusSigner(Signer):
             tx_hash,
         )
 
-    def _should_show_tx_hash(self) -> bool:
-        # super() omitted intentionally
-        # Plutus txs tend to contain a lot of opaque data, some users might
-        # want to verify only the tx hash.
-        return True
-
     async def _show_input(self, input: messages.CardanoTxInput) -> None:
         # super() omitted intentionally
         # The inputs are not interchangeable (because of datums), so we must show them.
diff --git a/core/src/apps/cardano/sign_tx/signer.py b/core/src/apps/cardano/sign_tx/signer.py
index 30e1534a7..c481de172 100644
--- a/core/src/apps/cardano/sign_tx/signer.py
+++ b/core/src/apps/cardano/sign_tx/signer.py
@@ -253,10 +253,6 @@ class Signer:
         # Final signing confirmation is handled separately in each signing mode.
         raise NotImplementedError
 
-    def _should_show_tx_hash(self) -> bool:
-        # By default we display tx hash only if showing details
-        return self.should_show_details
-
     # inputs
 
     async def _process_inputs(
diff --git a/core/src/apps/common/cbor.py b/core/src/apps/common/cbor.py
index dd90a4ba1..9ba9b2a41 100644
--- a/core/src/apps/common/cbor.py
+++ b/core/src/apps/common/cbor.py
@@ -271,38 +271,6 @@ def encode_streamed(value: Value) -> Iterator[bytes]:
     return _cbor_encode(value)
 
 
-def encode_chunked(value: Value, max_chunk_size: int) -> Iterator[bytes]:
-    """
-    Returns the encoded value as an iterable of chunks of a given size,
-    removing the need to reserve a continuous chunk of memory for the
-    full serialized representation of the value.
-    """
-    if max_chunk_size <= 0:
-        raise ValueError
-
-    chunks = encode_streamed(value)
-
-    chunk_buffer = utils.empty_bytearray(max_chunk_size)
-    try:
-        current_chunk_view = utils.BufferReader(next(chunks))
-        while True:
-            num_bytes_to_write = min(
-                current_chunk_view.remaining_count(),
-                max_chunk_size - len(chunk_buffer),
-            )
-            chunk_buffer.extend(current_chunk_view.read(num_bytes_to_write))
-
-            if len(chunk_buffer) >= max_chunk_size:
-                yield chunk_buffer
-                chunk_buffer[:] = bytes()
-
-            if current_chunk_view.remaining_count() == 0:
-                current_chunk_view = utils.BufferReader(next(chunks))
-    except StopIteration:
-        if len(chunk_buffer) > 0:
-            yield chunk_buffer
-
-
 def decode(cbor: bytes, offset: int = 0) -> Value:
     r = utils.BufferReader(cbor)
     r.seek(offset)
diff --git a/core/src/apps/common/paths.py b/core/src/apps/common/paths.py
index eeb2a2175..fcc76c2d2 100644
--- a/core/src/apps/common/paths.py
+++ b/core/src/apps/common/paths.py
@@ -326,12 +326,6 @@ class AlwaysMatchingSchema:
         return True
 
 
-class NeverMatchingSchema:
-    @staticmethod
-    def match(path: Bip32Path) -> bool:
-        return False
-
-
 # BIP-44 for basic (legacy) Bitcoin accounts, and widely used for other currencies:
 # https://github.com/bitcoin/bips/blob/master/bip-0044.mediawiki
 PATTERN_BIP44 = "m/44'/coin_type'/account'/change/address_index"
diff --git a/core/src/apps/common/writers.py b/core/src/apps/common/writers.py
index dccfefd53..9a65c74ba 100644
--- a/core/src/apps/common/writers.py
+++ b/core/src/apps/common/writers.py
@@ -19,13 +19,6 @@ def write_uint16_le(w: Writer, n: int) -> int:
     return 2
 
 
-def write_uint16_be(w: Writer, n: int) -> int:
-    ensure(0 <= n <= 0xFFFF)
-    w.append((n >> 8) & 0xFF)
-    w.append(n & 0xFF)
-    return 2
-
-
 def write_uint32_le(w: Writer, n: int) -> int:
     ensure(0 <= n <= 0xFFFF_FFFF)
     w.append(n & 0xFF)
diff --git a/core/src/apps/management/recovery_device/layout.py b/core/src/apps/management/recovery_device/layout.py
index 6b3bbc7c8..76175340d 100644
--- a/core/src/apps/management/recovery_device/layout.py
+++ b/core/src/apps/management/recovery_device/layout.py
@@ -89,18 +89,6 @@ async def show_dry_run_result(
         await show_warning(ctx, "warning_dry_recovery", text, button="Continue")
 
 
-async def show_dry_run_different_type(ctx: wire.GenericContext) -> None:
-    await show_warning(
-        ctx,
-        "warning_dry_recovery",
-        header="Dry run failure",
-        content="Seed in the device was\ncreated using another\nbackup mechanism.",
-        icon=ui.ICON_CANCEL,
-        icon_color=ui.ORANGE_ICON,
-        br_code=ButtonRequestType.ProtectCall,
-    )
-
-
 async def show_invalid_mnemonic(ctx: wire.GenericContext, word_count: int) -> None:
     if backup_types.is_slip39_word_count(word_count):
         await show_warning(
diff --git a/core/src/apps/tezos/helpers.py b/core/src/apps/tezos/helpers.py
index bdf1311d6..4ea7e4a54 100644
--- a/core/src/apps/tezos/helpers.py
+++ b/core/src/apps/tezos/helpers.py
@@ -94,13 +94,6 @@ def base58_encode_check(payload: bytes, prefix: str | None = None) -> str:
     return base58.encode_check(result)
 
 
-def base58_decode_check(enc: str, prefix: str | None = None) -> bytes:
-    decoded = base58.decode_check(enc)
-    if prefix is not None:
-        decoded = decoded[len(TEZOS_PREFIX_BYTES[prefix]) :]
-    return decoded
-
-
 def write_bool(w: Writer, boolean: bool) -> None:
     if boolean:
         write_uint8(w, 255)
diff --git a/core/src/apps/zcash/hasher.py b/core/src/apps/zcash/hasher.py
index fcfd47f51..df49fc8ee 100644
--- a/core/src/apps/zcash/hasher.py
+++ b/core/src/apps/zcash/hasher.py
@@ -51,23 +51,6 @@ class ZcashHasher:
         write_uint32(tx_hash_person, tx.branch_id)
         self.tx_hash_person = bytes(tx_hash_person)
 
-    # The `txid_digest` method is currently a dead code,
-    # but we keep it for future use cases.
-    def txid_digest(self) -> bytes:
-        """
-        Returns the transaction identifier.
-
-        see: https://zips.z.cash/zip-0244#id4
-        """
-        h = HashWriter(blake2b(outlen=32, personal=self.tx_hash_person))
-
-        write_hash(h, self.header.digest())  # T.1
-        write_hash(h, self.transparent.digest())  # T.2
-        write_hash(h, self.sapling.digest())  # T.3
-        write_hash(h, self.orchard.digest())  # T.4
-
-        return h.get_digest()
-
     def signature_digest(
         self, txi: TxInput | None, script_pubkey: bytes | None
     ) -> bytes:
diff --git a/core/src/trezor/crypto/slip39.py b/core/src/trezor/crypto/slip39.py
index f6faa106d..7678b2576 100644
--- a/core/src/trezor/crypto/slip39.py
+++ b/core/src/trezor/crypto/slip39.py
@@ -411,37 +411,6 @@ def _rs1024_verify_checksum(data: Indices) -> bool:
     return _rs1024_polymod(tuple(_CUSTOMIZATION_STRING) + data) == 1
 
 
-def _rs1024_error_index(data: Indices) -> int | None:
-    """
-    Returns the index where an error possibly occurred.
-    Currently unused.
-    """
-    GEN = (
-        0x91F_9F87,
-        0x122F_1F07,
-        0x244E_1E07,
-        0x81C_1C07,
-        0x1028_1C0E,
-        0x2040_1C1C,
-        0x10_3838,
-        0x20_7070,
-        0x40_E0E0,
-        0x81_C1C0,
-    )
-    chk = _rs1024_polymod(tuple(_CUSTOMIZATION_STRING) + data) ^ 1
-    if chk == 0:
-        return None
-
-    for i in reversed(range(len(data))):
-        b = chk & 0x3FF
-        chk >>= 10
-        if chk == 0:
-            return i
-        for j in range(10):
-            chk ^= GEN[j] if ((b >> j) & 1) else 0
-    return None
-
-
 # === Internal functions ===
 
 
diff --git a/core/src/trezor/log.py b/core/src/trezor/log.py
index 5a746683e..4f666e30f 100644
--- a/core/src/trezor/log.py
+++ b/core/src/trezor/log.py
@@ -51,10 +51,6 @@ def error(name: str, msg: str, *args: Any) -> None:
     _log(name, _ERROR, msg, *args)
 
 
-def critical(name: str, msg: str, *args: Any) -> None:
-    _log(name, _CRITICAL, msg, *args)
-
-
 def exception(name: str, exc: BaseException) -> None:
     # we are using `__class__.__name__` to avoid importing ui module
     # we also need to instruct typechecker to ignore the missing argument
diff --git a/core/src/trezor/strings.py b/core/src/trezor/strings.py
index c26414c5b..de8637ff2 100644
--- a/core/src/trezor/strings.py
+++ b/core/src/trezor/strings.py
@@ -21,10 +21,12 @@ def format_amount(amount: int, decimals: int) -> str:
     return s
 
 
-def format_ordinal(number: int) -> str:
-    return str(number) + {1: "st", 2: "nd", 3: "rd"}.get(
-        4 if 10 <= number % 100 < 20 else number % 10, "th"
-    )
+if False:
+
+    def format_ordinal(number: int) -> str:
+        return str(number) + {1: "st", 2: "nd", 3: "rd"}.get(
+            4 if 10 <= number % 100 < 20 else number % 10, "th"
+        )
 
 
 def format_plural(string: str, count: int, plural: str) -> str:
diff --git a/core/src/trezor/ui/__init__.py b/core/src/trezor/ui/__init__.py
index 2a86c4be0..ed8943fd7 100644
--- a/core/src/trezor/ui/__init__.py
+++ b/core/src/trezor/ui/__init__.py
@@ -105,19 +105,6 @@ def alert(count: int = 3) -> None:
     loop.schedule(_alert(count))
 
 
-async def click() -> Pos:
-    touch = loop.wait(io.TOUCH)
-    while True:
-        ev, *pos = await touch
-        if ev == io.TOUCH_START:
-            break
-    while True:
-        ev, *pos = await touch
-        if ev == io.TOUCH_END:
-            break
-    return pos  # type: ignore [Expression of type "list[Unknown]" cannot be assigned to return type "Pos"]
-
-
 def backlight_fade(val: int, delay: int = 14000, step: int = 15) -> None:
     if __debug__:
         if utils.DISABLE_ANIMATION:
diff --git a/core/src/trezor/utils.py b/core/src/trezor/utils.py
index 1a7331079..f79284ab3 100644
--- a/core/src/trezor/utils.py
+++ b/core/src/trezor/utils.py
@@ -192,36 +192,6 @@ if TYPE_CHECKING:
     BufferType = bytearray | memoryview
 
 
-class BufferWriter:
-    """Seekable and writeable view into a buffer."""
-
-    def __init__(self, buffer: BufferType) -> None:
-        self.buffer = buffer
-        self.offset = 0
-
-    def seek(self, offset: int) -> None:
-        """Set current offset to `offset`.
-
-        If negative, set to zero. If longer than the buffer, set to end of buffer.
-        """
-        offset = min(offset, len(self.buffer))
-        offset = max(offset, 0)
-        self.offset = offset
-
-    def write(self, src: bytes) -> int:
-        """Write exactly `len(src)` bytes into buffer, or raise EOFError.
-
-        Returns number of bytes written.
-        """
-        buffer = self.buffer
-        offset = self.offset
-        if len(src) > len(buffer) - offset:
-            raise EOFError
-        nwrite = memcpy(buffer, offset, src, 0)
-        self.offset += nwrite
-        return nwrite
-
-
 class BufferReader:
     """Seekable and readable view into a buffer."""
 
diff --git a/core/src/trezor/workflow.py b/core/src/trezor/workflow.py
index 3b87a7319..7cae81f2c 100644
--- a/core/src/trezor/workflow.py
+++ b/core/src/trezor/workflow.py
@@ -97,20 +97,22 @@ def set_default(constructor: Callable[[], loop.Task]) -> None:
     default_constructor = constructor
 
 
-def kill_default() -> None:
-    """Forcefully shut down default task.
+if False:
 
-    The purpose of the call is to prevent the default task from interfering with
-    a synchronous layout-less workflow (e.g., the progress bar in `mnemonic.get_seed`).
+    def kill_default() -> None:
+        """Forcefully shut down default task.
 
-    This function should only be called from a workflow registered with `on_start`.
-    Otherwise the default will be restarted immediately.
-    """
-    if default_task:
-        if __debug__:
-            log.debug(__name__, "close default")
-        # We let the `_finalize_default` reset the global.
-        default_task.close()
+        The purpose of the call is to prevent the default task from interfering with
+        a synchronous layout-less workflow (e.g., the progress bar in `mnemonic.get_seed`).
+
+        This function should only be called from a workflow registered with `on_start`.
+        Otherwise the default will be restarted immediately.
+        """
+        if default_task:
+            if __debug__:
+                log.debug(__name__, "close default")
+            # We let the `_finalize_default` reset the global.
+            default_task.close()
 
 
 def close_others() -> None:
diff --git a/core/tests/test_apps.common.cbor.py b/core/tests/test_apps.common.cbor.py
index ad57b0582..7ce79139b 100644
--- a/core/tests/test_apps.common.cbor.py
+++ b/core/tests/test_apps.common.cbor.py
@@ -11,10 +11,44 @@ from apps.common.cbor import (
     create_embedded_cbor_bytes_header,
     decode,
     encode,
-    encode_chunked,
     encode_streamed,
+    utils
 )
 
+# NOTE: moved into tests not to occupy flash space
+# in firmware binary, when it is not used in production
+def encode_chunked(value: "Value", max_chunk_size: int) -> "Iterator[bytes]":
+    """
+    Returns the encoded value as an iterable of chunks of a given size,
+    removing the need to reserve a continuous chunk of memory for the
+    full serialized representation of the value.
+    """
+    if max_chunk_size <= 0:
+        raise ValueError
+
+    chunks = encode_streamed(value)
+
+    chunk_buffer = utils.empty_bytearray(max_chunk_size)
+    try:
+        current_chunk_view = utils.BufferReader(next(chunks))
+        while True:
+            num_bytes_to_write = min(
+                current_chunk_view.remaining_count(),
+                max_chunk_size - len(chunk_buffer),
+            )
+            chunk_buffer.extend(current_chunk_view.read(num_bytes_to_write))
+
+            if len(chunk_buffer) >= max_chunk_size:
+                yield chunk_buffer
+                chunk_buffer[:] = bytes()
+
+            if current_chunk_view.remaining_count() == 0:
+                current_chunk_view = utils.BufferReader(next(chunks))
+    except StopIteration:
+        if len(chunk_buffer) > 0:
+            yield chunk_buffer
+
+
 
 class TestCardanoCbor(unittest.TestCase):
     def test_create_array_header(self):
diff --git a/core/tests/test_apps.common.paths.py b/core/tests/test_apps.common.paths.py
index ce76536d9..d47b40f1e 100644
--- a/core/tests/test_apps.common.paths.py
+++ b/core/tests/test_apps.common.paths.py
@@ -2,6 +2,13 @@ from common import *
 from trezor.utils import ensure
 from apps.common.paths import *
 
+# NOTE: moved into tests not to occupy flash space
+# in firmware binary, when it is not used in production
+class NeverMatchingSchema:
+    @staticmethod
+    def match(path: "Bip32Path") -> bool:
+        return False
+
 
 class TestPaths(unittest.TestCase):
     def test_is_hardened(self):
diff --git a/core/tests/test_apps.tezos.encode.py b/core/tests/test_apps.tezos.encode.py
index 504126be1..78ef0b6fa 100644
--- a/core/tests/test_apps.tezos.encode.py
+++ b/core/tests/test_apps.tezos.encode.py
@@ -3,7 +3,7 @@ from common import *
 if not utils.BITCOIN_ONLY:
     from trezor.enums import TezosContractType
     from trezor.messages import TezosContractID
-    from apps.tezos.helpers import base58_decode_check, base58_encode_check, write_bool
+    from apps.tezos.helpers import base58_encode_check, write_bool
     from apps.tezos.sign_tx import (
         _encode_contract_id,
         _encode_data_with_bool_prefix,
@@ -80,21 +80,6 @@ class TestTezosEncoding(unittest.TestCase):
         )
         self.assertEqual(base58_encode_check(pkh), "2U14dJ6ED97bBHDZTQWA6umVL8SAVefXj")
 
-    def test_tezos_base58_decode_check(self):
-        pkh = unhexlify("101368afffeb1dc3c089facbbe23f5c30b787ce9")
-
-        address = "tz1M72kkAJrntPtayM4yU4CCwQPLSdpEgRrn"
-        self.assertEqual(base58_decode_check(address, prefix="tz1"), pkh)
-
-        address = "tz29nEixktH9p9XTFX7p8hATUyeLxXEz96KR"
-        self.assertEqual(base58_decode_check(address, prefix="tz2"), pkh)
-
-        address = "tz3Mo3gHekQhCmykfnC58ecqJLXrjMKzkF2Q"
-        self.assertEqual(base58_decode_check(address, prefix="tz3"), pkh)
-
-        address = "2U14dJ6ED97bBHDZTQWA6umVL8SAVefXj"
-        self.assertEqual(base58_decode_check(address), pkh)
-
     def test_tezos_encode_natural(self):
         inputs = [200000000000, 2000000, 159066, 200, 60000, 157000000, 0]
         outputs = ["0080c0ee8ed20b", "008092f401", "009ab513", "008803", "00a0a907", "008085dd9501", "0000"]
diff --git a/core/tests/test_apps.zcash.zip244.py b/core/tests/test_apps.zcash.zip244.py
index 4ab474cff..2bc03bfb6 100644
--- a/core/tests/test_apps.zcash.zip244.py
+++ b/core/tests/test_apps.zcash.zip244.py
@@ -1,14 +1,31 @@
 from common import *
 from trezor.messages import TxInput, SignTx, PrevOutput
 from trezor.enums import InputScriptType
-from apps.zcash.hasher import ZcashHasher
-from apps.bitcoin.common import SigHashType
+from apps.zcash.hasher import ZcashHasher, HashWriter, blake2b, write_hash
 from apps.common.coininfo import by_name
 
 
 ZCASH_COININFO = by_name("Zcash")
 
 
+# NOTE: moved into tests not to occupy flash space
+# in firmware binary, when it is not used in production
+def txid_digest(hasher: "ZcashHasher") -> bytes:
+    """
+    Returns the transaction identifier.
+
+    see: https://zips.z.cash/zip-0244#id4
+    """
+    h = HashWriter(blake2b(outlen=32, personal=hasher.tx_hash_person))
+
+    write_hash(h, hasher.header.digest())  # T.1
+    write_hash(h, hasher.transparent.digest())  # T.2
+    write_hash(h, hasher.sapling.digest())  # T.3
+    write_hash(h, hasher.orchard.digest())  # T.4
+
+    return h.get_digest()
+
+
 @unittest.skipUnless(not utils.BITCOIN_ONLY, "altcoin")
 class TestZcashSigHasher(unittest.TestCase):
     def test_zcash_hasher(self):
@@ -86,7 +103,7 @@ class TestZcashSigHasher(unittest.TestCase):
             hasher.add_output(txo, txo.script_pubkey)
 
         # test ZcashSigHasher.txid_digest
-        computed_txid = hasher.txid_digest()
+        computed_txid = txid_digest(hasher)
         self.assertEqual(computed_txid, expected_txid)
 
         # test ZcashSigHasher.signature_digest
diff --git a/core/tests/test_trezor.crypto.slip39.py b/core/tests/test_trezor.crypto.slip39.py
index 28365baad..262e98274 100644
--- a/core/tests/test_trezor.crypto.slip39.py
+++ b/core/tests/test_trezor.crypto.slip39.py
@@ -2,6 +2,39 @@ from common import *
 from trezor.crypto import slip39, random
 from slip39_vectors import vectors
 
+
+# NOTE: moved into tests not to occupy flash space
+# in firmware binary, when it is not used in production
+def _rs1024_error_index(data: tuple[int, ...]) -> int | None:
+    """
+    Returns the index where an error possibly occurred.
+    """
+    GEN = (
+        0x91F_9F87,
+        0x122F_1F07,
+        0x244E_1E07,
+        0x81C_1C07,
+        0x1028_1C0E,
+        0x2040_1C1C,
+        0x10_3838,
+        0x20_7070,
+        0x40_E0E0,
+        0x81_C1C0,
+    )
+    chk = slip39._rs1024_polymod(tuple(slip39._CUSTOMIZATION_STRING) + data) ^ 1
+    if chk == 0:
+        return None
+
+    for i in reversed(range(len(data))):
+        b = chk & 0x3FF
+        chk >>= 10
+        if chk == 0:
+            return i
+        for j in range(10):
+            chk ^= GEN[j] if ((b >> j) & 1) else 0
+    return None
+
+
 def combinations(iterable, r):
     # Taken from https://docs.python.org/3.7/library/itertools.html#itertools.combinations
     pool = tuple(iterable)
@@ -160,11 +193,11 @@ class TestCryptoSlip39(unittest.TestCase):
         ]
         for mnemonic in mnemonics:
             data = tuple(slip39._mnemonic_to_indices(mnemonic))
-            self.assertEqual(slip39._rs1024_error_index(data), None)
+            self.assertEqual(_rs1024_error_index(data), None)
             for i in range(len(data)):
                 for _ in range(50):
                     error_data = error_data = data[:i] + (data[i] ^ (random.uniform(1023) + 1), ) + data[i + 1:]
-                    self.assertEqual(slip39._rs1024_error_index(error_data), i)
+                    self.assertEqual(_rs1024_error_index(error_data), i)
 
 
 if __name__ == '__main__':