(Cross post from r/MechanicalKeyboards, where this question got no response)
I’ve managed to create a firmware .hex file with the beta QMK configurator on the web, but after a bit of googling I can’t find straightforward instructions on how to flash it from a modern macOS machine (a 13” M1 running Big Sur.)
I’ve installed `qmk-toolbox` and `dfu-programmer` (via brew) but I can’t work out which of these I have to use (or both?) to actually flash the .hex file. As an extra complication it seems I’ve got an early keyboard with the xwhatsit firmware installed (System Report says I’ve got “ibm-capsense-usb” hanging off the USB bus.)
How do I get it into DFU mode? Do I have to `dfu-programmer atmega32u2 erase` before I `dfu-programmer atmega32u2 flash layout.hex`? Is that the right chip name? Will `dfu-programmer` work or do I have to use something from `qmk-toolbox`?