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I bought this keyboard (XVX Jadestone M67) and the vendor published a binary file for use with QMK but they have been reluctant to send me any information about how it was compiled. I feel kinda ripped off but I should be able to figure out how to write firmware for it anyway.

The best I could do was assume the DFU was wb32-based from qmk flash output, and also analyzing the binary shows the controller probably is ARMhf. That checks out so it could be any number of Westberry microcontrollers (I could find like 6 out of 7 listed online?). I did flash that binary file and the keyboard operation is apparently the same (any updates were for the wireless version and I have the wired one)

Anyway, I'm wondering if anyone has general advice for RE-ing firmware, finding details on microcontrollers, or shooting in the dark trying to do QMK stuff. Thanks!