Manta M8P + CM4 , no usb connection , not flashing from SD card

[Erik-Erikson]

I have just installed a CM4 onto a (V1.0) M8P

I can SSH into the board just fine and have compiled the firmware.
When I use a SD card to first flash the firmware-usb.bin (renamed to firmware.bin) nothing happens.
I tried renaming the firmware-usb.bin to FIRMWARE.bin to no effect.

Further more when using the command : ls /dev/serial/by-id/* to list the MCU serial the responce is :
No such file or directory.

I have enabled the USB2.0 HUB in the config.txt
To check usb functionality I connected a SKR1.4 to the USB-A connection and running the command again it does find it
So the config.txt is edited Ok i think.

[looxonline]

You may need to use the SWD interface to program the MCU.

[looxonline]

Also, check that your OS is not dumping any hidden files onto your SD card. macOS does this sometimes and it messes with the bootloader.

[QuinFromCanada]

Check what file system your SD card is formatted for. I used a new SD card out of the box, and I didn't check and had the same issue. after I formatted it to FAT32 it worked.

[PSpiel]

Hello, Similar problem... though I had to find an old and smaller SD card (2GB) as my 32 GB new SD would not work.
Hope that helps others too.

[Alexpanai]

I had the same issue. Defiantly a smaller card (not 64Gb as I tried for 2 days) formatted in FAT32 was the way to go. Strangely enough I didn't manage to format in FAT32 the bigger cards.

[alex-crr]

I have a 2Gb FAT32 sd card, and it is still not working. When trying through DFU i have no serial Id created so I assume it is not working either. I have another board, MantaE3eZ for which it worked perfectly fine. Any more insights on how to solve?

[manotroll]

I found the solution to the problem in a video on YouTube, I'll put it here so you can see
There is an error in the PDF explanation in the manual on how to do it
https://www.youtube.com/watch?v=k8DmTrY2GgY