USB device malfunctioned / can't upload anymore

i am on arduino IDE windows, i was able to upload 2-3 sketches including lora sending, all was working fine. now i get this USB malfunction error and the Port doesn’t show up in tools (greyed out)
i tried to reset the board (kit) by clicking for 5 seconds (like with arduinos) but this didnt help.

any idea what i can do?

Try to quickly press Reset button twice.
The device should be shown as USB drive on Windows. Ignore the drive and retry to flash from ArduinoIDE.

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thx Bernd for the quick reply, works like a charm!

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Please update your bootloader on the RAK4631.
See this post