diff --git a/common/protob/messages-debug.proto b/common/protob/messages-debug.proto
index 6a1876c18..eeeb7563c 100644
--- a/common/protob/messages-debug.proto
+++ b/common/protob/messages-debug.proto
@@ -173,3 +173,15 @@ message DebugLinkMemoryWrite {
 message DebugLinkFlashErase {
     optional uint32 sector = 1;
 }
+
+
+/**
+ * Request: Erase the SD card
+ * @start
+ * @next Success
+ * @next Failure
+ */
+message DebugLinkEraseSdCard {
+    optional bool format = 1;  // if true, the card will be formatted to FAT32.
+                               // if false, it will be all 0xFF bytes.
+}
diff --git a/common/protob/messages.proto b/common/protob/messages.proto
index 0f4af5e79..879aa1fcb 100644
--- a/common/protob/messages.proto
+++ b/common/protob/messages.proto
@@ -113,6 +113,7 @@ enum MessageType {
     MessageType_DebugLinkReseedRandom = 9002 [(wire_debug_in) = true];
     MessageType_DebugLinkRecordScreen = 9003 [(wire_debug_in) = true];
     MessageType_DebugLinkShowText = 9004 [(wire_debug_in) = true];
+    MessageType_DebugLinkEraseSdCard = 9005 [(wire_debug_in) = true];
 
     // Ethereum
     MessageType_EthereumGetPublicKey = 450 [(wire_in) = true];
diff --git a/core/src/apps/debug/__init__.py b/core/src/apps/debug/__init__.py
index c0293772f..af2122e47 100644
--- a/core/src/apps/debug/__init__.py
+++ b/core/src/apps/debug/__init__.py
@@ -17,6 +17,7 @@ if __debug__:
         from trezor.messages.DebugLinkRecordScreen import DebugLinkRecordScreen
         from trezor.messages.DebugLinkReseedRandom import DebugLinkReseedRandom
         from trezor.messages.DebugLinkState import DebugLinkState
+        from trezor.messages.DebugLinkEraseSdCard import DebugLinkEraseSdCard
 
     save_screen = False
     save_screen_directory = "."
@@ -138,6 +139,27 @@ if __debug__:
             crypto.random.reseed(msg.value)
         return Success()
 
+    async def dispatch_DebugLinkEraseSdCard(
+        ctx: wire.Context, msg: DebugLinkEraseSdCard
+    ) -> Success:
+        try:
+            io.sdcard.power_on()
+            if msg.format:
+                fs = io.FatFS()
+                fs.mkfs()
+            else:
+                # trash first 1 MB of data to destroy the FAT filesystem
+                assert io.sdcard.capacity() >= 1024 * 1024
+                empty_block = bytes([0xFF] * io.sdcard.BLOCK_SIZE)
+                for i in range(1024 * 1024 // io.sdcard.BLOCK_SIZE):
+                    io.sdcard.write(i, empty_block)
+
+        except OSError:
+            raise wire.ProcessError("SD card operation failed")
+        finally:
+            io.sdcard.power_off()
+        return Success()
+
     def boot() -> None:
         # wipe storage when debug build is used on real hardware
         if not utils.EMULATOR:
@@ -149,3 +171,4 @@ if __debug__:
         wire.register(MessageType.DebugLinkGetState, dispatch_DebugLinkGetState)
         wire.register(MessageType.DebugLinkReseedRandom, dispatch_DebugLinkReseedRandom)
         wire.register(MessageType.DebugLinkRecordScreen, dispatch_DebugLinkRecordScreen)
+        wire.register(MessageType.DebugLinkEraseSdCard, dispatch_DebugLinkEraseSdCard)
diff --git a/core/src/trezor/messages/DebugLinkEraseSdCard.py b/core/src/trezor/messages/DebugLinkEraseSdCard.py
new file mode 100644
index 000000000..58a090d26
--- /dev/null
+++ b/core/src/trezor/messages/DebugLinkEraseSdCard.py
@@ -0,0 +1,26 @@
+# Automatically generated by pb2py
+# fmt: off
+import protobuf as p
+
+if __debug__:
+    try:
+        from typing import Dict, List  # noqa: F401
+        from typing_extensions import Literal  # noqa: F401
+    except ImportError:
+        pass
+
+
+class DebugLinkEraseSdCard(p.MessageType):
+    MESSAGE_WIRE_TYPE = 9005
+
+    def __init__(
+        self,
+        format: bool = None,
+    ) -> None:
+        self.format = format
+
+    @classmethod
+    def get_fields(cls) -> Dict:
+        return {
+            1: ('format', p.BoolType, 0),
+        }
diff --git a/core/src/trezor/messages/MessageType.py b/core/src/trezor/messages/MessageType.py
index 4f6497015..94e5be334 100644
--- a/core/src/trezor/messages/MessageType.py
+++ b/core/src/trezor/messages/MessageType.py
@@ -77,6 +77,7 @@ DebugLinkLayout = 9001  # type: Literal[9001]
 DebugLinkReseedRandom = 9002  # type: Literal[9002]
 DebugLinkRecordScreen = 9003  # type: Literal[9003]
 DebugLinkShowText = 9004  # type: Literal[9004]
+DebugLinkEraseSdCard = 9005  # type: Literal[9005]
 if not utils.BITCOIN_ONLY:
     EthereumGetPublicKey = 450  # type: Literal[450]
     EthereumPublicKey = 451  # type: Literal[451]
diff --git a/legacy/firmware/protob/Makefile b/legacy/firmware/protob/Makefile
index 34433bafa..dfd4fbe45 100644
--- a/legacy/firmware/protob/Makefile
+++ b/legacy/firmware/protob/Makefile
@@ -3,7 +3,7 @@ Q := @
 endif
 
 SKIPPED_MESSAGES := Binance Cardano DebugMonero Eos Monero Ontology Ripple SdProtect Tezos WebAuthn \
-	DebugLinkRecordScreen DebugLinkReseedRandom DebugLinkShowText
+	DebugLinkRecordScreen DebugLinkReseedRandom DebugLinkShowText DebugLinkEraseSdCard
 
 ifeq ($(BITCOIN_ONLY), 1)
 SKIPPED_MESSAGES += Ethereum Lisk NEM Stellar
diff --git a/python/src/trezorlib/messages/DebugLinkEraseSdCard.py b/python/src/trezorlib/messages/DebugLinkEraseSdCard.py
new file mode 100644
index 000000000..e640527af
--- /dev/null
+++ b/python/src/trezorlib/messages/DebugLinkEraseSdCard.py
@@ -0,0 +1,26 @@
+# Automatically generated by pb2py
+# fmt: off
+from .. import protobuf as p
+
+if __debug__:
+    try:
+        from typing import Dict, List  # noqa: F401
+        from typing_extensions import Literal  # noqa: F401
+    except ImportError:
+        pass
+
+
+class DebugLinkEraseSdCard(p.MessageType):
+    MESSAGE_WIRE_TYPE = 9005
+
+    def __init__(
+        self,
+        format: bool = None,
+    ) -> None:
+        self.format = format
+
+    @classmethod
+    def get_fields(cls) -> Dict:
+        return {
+            1: ('format', p.BoolType, 0),
+        }
diff --git a/python/src/trezorlib/messages/MessageType.py b/python/src/trezorlib/messages/MessageType.py
index f24095c89..5bd0e8fc5 100644
--- a/python/src/trezorlib/messages/MessageType.py
+++ b/python/src/trezorlib/messages/MessageType.py
@@ -75,6 +75,7 @@ DebugLinkLayout = 9001  # type: Literal[9001]
 DebugLinkReseedRandom = 9002  # type: Literal[9002]
 DebugLinkRecordScreen = 9003  # type: Literal[9003]
 DebugLinkShowText = 9004  # type: Literal[9004]
+DebugLinkEraseSdCard = 9005  # type: Literal[9005]
 EthereumGetPublicKey = 450  # type: Literal[450]
 EthereumPublicKey = 451  # type: Literal[451]
 EthereumGetAddress = 56  # type: Literal[56]
diff --git a/python/src/trezorlib/messages/__init__.py b/python/src/trezorlib/messages/__init__.py
index 28e4bfd33..a218abe54 100644
--- a/python/src/trezorlib/messages/__init__.py
+++ b/python/src/trezorlib/messages/__init__.py
@@ -40,6 +40,7 @@ from .CosiCommitment import CosiCommitment
 from .CosiSign import CosiSign
 from .CosiSignature import CosiSignature
 from .DebugLinkDecision import DebugLinkDecision
+from .DebugLinkEraseSdCard import DebugLinkEraseSdCard
 from .DebugLinkFlashErase import DebugLinkFlashErase
 from .DebugLinkGetState import DebugLinkGetState
 from .DebugLinkLayout import DebugLinkLayout