On my 4343 Monster M4sk from Adafruit Industries LLC the red LED is blinking and the screens are not working. What do I do? This is a rare but known problem with these boards. Here is the solution from the Adafruit FAQ.
Board Unresponsive; Flashing Red LED
There is an extremely small but nonzero chance of a glitch that wipes the board’s flash filesystem. No eyes, just a flashing red LED. We’ve yet to track down the source of this bug. Fortunately it’s pretty rare, and usually just when loading a new design.
If this happens with your board, you’ll need to completely wipe and reinstate the flash filesystem. Any files on your board are lost … it’s strongly recommended to maintain a backup of any customized files.
To recover from this situation:
- Visit the CircuitPython download page and search for your board — either MONSTER M4SK or HalloWing M4 (not M0).
- Download two files there: a CircuitPython “UF2” installer (current stable release), and bootloader updater UF2 (further down on the same page).
- Connect board to computer with USB cable, set switch to “on” position, and double-tap the board’s reset button. After a few seconds, you should see a small flash drive called MASKM4BOOT or HALLOM4BOOT.
- Drag the bootloader UF2 file to the boot drive. That drive will go away for about 10 seconds while the software works, and then reappear once it’s finished.
- Drag the CircuitPython UF2 file to the boot drive. That drive will go away and is replaced in a few seconds with one called CIRCUITPY. You should see some text on the board’s display now.
- Reload eye graphics files to the CIRCUITPY drive, either one of the ready-made designs, or from a backup of your customized files.
- Download and install the M4 EYES firmware as explained on this page. This is another double-tap-drag-UF2 sequence, like we did above.
Everything on your board should be factory fresh now.
For answers to other FAQs about the 4343, please see the FAQ on the Adafruit website.
Troubleshooting | Adafruit MONSTER M4SK | Adafruit Learning System