diff --git a/tests/common.py b/tests/common.py
index b2a20bb39d..bff33da790 100644
--- a/tests/common.py
+++ b/tests/common.py
@@ -195,7 +195,7 @@ def click_through(
 def read_and_confirm_mnemonic(
     debug: "DebugLink", choose_wrong: bool = False
 ) -> Generator[None, "ButtonRequest", Optional[str]]:
-    """Read a given number of mnemonic words from the screen and answer
+    """Read mnemonic words from the screen and answer
     confirmation questions.
     Return the full mnemonic or None if `choose_wrong` is True.
 
diff --git a/tests/device_tests/test_msg_backup_device.py b/tests/device_tests/test_msg_backup_device.py
index 960efd84ff..876d3ea18c 100644
--- a/tests/device_tests/test_msg_backup_device.py
+++ b/tests/device_tests/test_msg_backup_device.py
@@ -27,6 +27,7 @@ from ..common import (
     MNEMONIC12,
     MNEMONIC_SLIP39_ADVANCED_20,
     MNEMONIC_SLIP39_CUSTOM_SECRET,
+    MNEMONIC_SLIP39_SINGLE_EXT_20,
     MNEMONIC_SLIP39_BASIC_20_3of6,
     MNEMONIC_SLIP39_CUSTOM_1of1,
 )
@@ -89,6 +90,32 @@ def test_backup_slip39_basic(client: Client, click_info: bool):
     assert expected_ms == actual_ms
 
 
+@pytest.mark.models("core")
+@pytest.mark.setup_client(needs_backup=True, mnemonic=MNEMONIC_SLIP39_SINGLE_EXT_20)
+def test_backup_slip39_single(client: Client):
+    assert client.features.backup_availability == messages.BackupAvailability.Required
+
+    with client:
+        IF = InputFlowBip39Backup(
+            client, confirm_success=(client.layout_type is not LayoutType.Mercury)
+        )
+        client.set_input_flow(IF.get())
+        device.backup(client)
+
+    client.init_device()
+    assert client.features.initialized is True
+    assert (
+        client.features.backup_availability == messages.BackupAvailability.NotAvailable
+    )
+
+    assert client.features.unfinished_backup is False
+    assert client.features.no_backup is False
+    assert client.features.backup_type is messages.BackupType.Slip39_Single_Extendable
+    assert shamir.combine_mnemonics([IF.mnemonic]) == shamir.combine_mnemonics(
+        MNEMONIC_SLIP39_SINGLE_EXT_20
+    )
+
+
 @pytest.mark.models("core")
 @pytest.mark.setup_client(needs_backup=True, mnemonic=MNEMONIC_SLIP39_ADVANCED_20)
 @pytest.mark.parametrize(
diff --git a/tests/input_flows.py b/tests/input_flows.py
index 70c3bdc4f5..5036efcd76 100644
--- a/tests/input_flows.py
+++ b/tests/input_flows.py
@@ -1216,8 +1216,9 @@ class InputFlowEthereumSignTxStaking(InputFlowBase):
         yield from self.ETH.confirm_tx_staking(info=True)
 
 
-def get_mnemonic_and_confirm_success(
+def get_mnemonic(
     debug: DebugLink,
+    confirm_success: bool = True,
 ) -> Generator[None, "messages.ButtonRequest", str]:
     # mnemonic phrases
     mnemonic = yield from read_and_confirm_mnemonic(debug)
@@ -1228,8 +1229,10 @@ def get_mnemonic_and_confirm_success(
         assert br.code == B.Success
         debug.press_yes()
 
-    br = yield  # confirm success
-    assert br.code == B.Success
+    if confirm_success:
+        br = yield
+        assert br.code == B.Success
+
     debug.press_yes()
 
     assert mnemonic is not None
@@ -1237,9 +1240,10 @@ def get_mnemonic_and_confirm_success(
 
 
 class InputFlowBip39Backup(InputFlowBase):
-    def __init__(self, client: Client):
+    def __init__(self, client: Client, confirm_success: bool = True):
         super().__init__(client)
         self.mnemonic = None
+        self.confirm_success = confirm_success
 
     def input_flow_common(self) -> BRGeneratorType:
         # 1. Backup intro
@@ -1247,7 +1251,7 @@ class InputFlowBip39Backup(InputFlowBase):
         yield from click_through(self.debug, screens=2, code=B.ResetDevice)
 
         # mnemonic phrases and rest
-        self.mnemonic = yield from get_mnemonic_and_confirm_success(self.debug)
+        self.mnemonic = yield from get_mnemonic(self.debug, self.confirm_success)
 
 
 class InputFlowBip39ResetBackup(InputFlowBase):
@@ -1264,7 +1268,7 @@ class InputFlowBip39ResetBackup(InputFlowBase):
         yield from click_through(self.debug, screens=4, code=B.ResetDevice)
 
         # mnemonic phrases and rest
-        self.mnemonic = yield from get_mnemonic_and_confirm_success(self.debug)
+        self.mnemonic = yield from get_mnemonic(self.debug)
 
     def input_flow_tr(self) -> BRGeneratorType:
         # 1. Confirm Reset
@@ -1274,7 +1278,7 @@ class InputFlowBip39ResetBackup(InputFlowBase):
         yield from click_through(self.debug, screens=4, code=B.ResetDevice)
 
         # mnemonic phrases and rest
-        self.mnemonic = yield from get_mnemonic_and_confirm_success(self.debug)
+        self.mnemonic = yield from get_mnemonic(self.debug)
 
     def input_flow_t3t1(self) -> BRGeneratorType:
         # 1. Confirm Reset
@@ -1285,7 +1289,7 @@ class InputFlowBip39ResetBackup(InputFlowBase):
         yield from click_through(self.debug, screens=5, code=B.ResetDevice)
 
         # mnemonic phrases and rest
-        self.mnemonic = yield from get_mnemonic_and_confirm_success(self.debug)
+        self.mnemonic = yield from get_mnemonic(self.debug)
 
 
 class InputFlowBip39ResetPIN(InputFlowBase):