nrf52840 unable to flash firmware | ZMK | Page 1

raw venture May 27, 2024, 5:18 PM

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I tried creating a firmware using https://github.com/Univa/rumcake, it explicitely say Converting the binary to a UF2 and flashing that to the MCU doesn't seem to work but I tried it anyway, I copied the uf2 file and the microcontroller started flashing, now it won't stop, not even after powering off. I can enter bootloader mode and the device shows up as usual but I cant put my ZMK firmware back on

stark magnet May 27, 2024, 5:30 PM

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That red led constantly blinking means that either the controller is bootlooping (due to bad firmware) or stuck in bootloader mode (e.g. due to a short). The first one sounds more likely

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If the firmware you flashed before had the wrong code partitions defined, it might have made ZMK impossible to flash. I think reflashing the bootloader fixes that, so I would try that

raw venture May 27, 2024, 5:33 PM

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you mean reflashing as described in https://github.com/joric/nrfmicro/wiki/Bootloader ?

GitHub

Bootloader

A Pro Micro alternative for wireless keyboards. Contribute to joric/nrfmicro development by creating an account on GitHub.

scenic pond May 27, 2024, 5:34 PM

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raw venture you mean reflashing as described in https://github.com/joric/nrfmicro/wiki/Bootl...

IIRC the reason it says "Converting the binary to a UF2 and flashing that to the MCU doesn't seem to work" is because it'll corrupt the bootloader. You'll need to do https://nicekeyboards.com/docs/nice-nano/troubleshooting/

Troubleshooting - nice!nano

Troubleshooting tips for the nice!nano

raw venture May 27, 2024, 5:48 PM

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It worked, It isn´t bootlooping anymore, but my ZMK firmware doesn't seem to work

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i have already flashed the setting reset firmware as well

stark magnet May 27, 2024, 6:01 PM

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Need more details on that, tbh

raw venture May 27, 2024, 6:27 PM

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Nvm it worked

#nrf52840 unable to flash firmware