#USB not working when flashing zmk

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digital fiber
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Ive made a board and used a nrf52840 as the controller.
I programmed the adafruit bootloader and now the controller is recognised as a storage medium. Just like it should behave. This means the usb Interface and wiring on the board is working.

Problem:
When moving the compiled zmk software to the board, it restarts and then nothing. It isnt recognised by my pc in any way.

Tested:
Using the settings for other nrf52840 based boards
Reinstalling all tools
Going from Zephyr SDK 16.4 to 15.0

I cannot use USB debugging because there is no connection.

real canopy
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You might want to share your board definition, at least