clear pin failures on wipe and when in debug mode

firmware/fsm.c

@@ -241,6 +241,7 @@ void fsm_msgWipeDevice(WipeDevice *msg)
 	storage_reset();
 	storage_reset_uuid();
 	storage_commit();
+	storage_clearPinArea();
 	// the following does not work on Mac anyway :-/ Linux/Windows are fine, so it is not needed
 	// usbReconnect(); // force re-enumeration because of the serial number change
 	fsm_sendSuccess("Device wiped");

firmware/storage.c

@@ -419,6 +419,15 @@ bool session_isPinCached(void)
 	return sessionPinCached;
 }
 
+void storage_clearPinArea()
+{
+	flash_clear_status_flags();
+	flash_unlock();
+	flash_erase_sector(FLASH_META_SECTOR_LAST, FLASH_CR_PROGRAM_X32);
+	flash_lock();
+	storage_check_flash_errors();
+}
+
 void storage_resetPinFails(uint32_t *pinfailsptr)
 {
 	flash_clear_status_flags();

firmware/storage.h

@@ -56,6 +56,7 @@ bool storage_hasPin(void);
 void storage_setPin(const char *pin);
 void session_cachePin(void);
 bool session_isPinCached(void);
+void storage_clearPinArea(void);
 void storage_resetPinFails(uint32_t *pinfailptr);
 bool storage_increasePinFails(uint32_t *pinfailptr);
 uint32_t *storage_getPinFailsPtr(void);

firmware/trezor.c

@@ -50,6 +50,7 @@ int main(void)
 	storage_reset(); // wipe storage if debug link
 	storage_reset_uuid();
 	storage_commit();
+	storage_clearPinArea(); // reset PIN failures if debug link
 #endif
 
 	oledDrawBitmap(40, 0, &bmp_logo64);