diff --git a/ports/stm32f4/Makefile b/ports/stm32f4/Makefile
index 6c5190668f..93cde67371 100755
--- a/ports/stm32f4/Makefile
+++ b/ports/stm32f4/Makefile
@@ -22,7 +22,7 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
-#DEBUG = 1
+DEBUG = 1
 
 # Select the board to build for.
 ifeq ($(BOARD),)
@@ -256,7 +256,7 @@ $(BUILD)/firmware.hex: $(BUILD)/firmware.elf
 
 $(BUILD)/firmware.uf2: $(BUILD)/firmware.hex
 	$(ECHO) "Create $@"
-	$(PYTHON3) $(TOP)/tools/uf2/utils/uf2conv.py -f 0x57755a57 -b 0x08010000 -c -o "$(BUILD)/firmware.uf2" $^
+	$(PYTHON3) $(TOP)/tools/uf2/utils/uf2conv.py -f 0x57755a57 -b 0x08000000 -c -o "$(BUILD)/firmware.uf2" $^
 
 include $(TOP)/py/mkrules.mk
 
diff --git a/ports/stm32f4/boards/meowbit_v121/mpconfigboard.mk b/ports/stm32f4/boards/meowbit_v121/mpconfigboard.mk
index e40f9d80ca..73f1d722af 100644
--- a/ports/stm32f4/boards/meowbit_v121/mpconfigboard.mk
+++ b/ports/stm32f4/boards/meowbit_v121/mpconfigboard.mk
@@ -2,7 +2,7 @@ USB_VID = 0x239A
 USB_PID = 0x805A
 USB_PRODUCT = "Meowbit"
 USB_MANUFACTURER = "Kittenbot"
-USB_DEVICES = "CDC"
+USB_DEVICES = "CDC,MSC"
 
 SPI_FLASH_FILESYSTEM = 1
 EXTERNAL_FLASH_DEVICE_COUNT = 1
@@ -17,6 +17,7 @@ MCU_VARIANT = stm32f4
 MCU_SUB_VARIANT = stm32f401xe
 MCU_PACKAGE = 64
 CMSIS_MCU = STM32F401xE
-LD_FILE = boards/STM32F401_boot.ld #STM32F401_fs.ld
+# LD_FILE = boards/STM32F401_boot.ld 
+LD_FILE = boards/STM32F401_fs.ld
 TEXT0_ADDR = 0x08010000
 TEXT1_ADDR = 0x08040000
\ No newline at end of file