Okay, so I'm a bit stuck now.
This discussion is also happening on keebtalk:
https://www.keebtalk.com/t/struggling-to-flash-hs60-v2-with-arm-stm32f303cc/5063At this point my PCB is unusable
Keep in mind, the HS60v2 stuff doesn't work in qmk toolbox. The board is listed, but the compiled defaults are not on the repo, so you can't use it. Also, the .bin files listed on mechboards do not work on these PCBs.
I set up an environment to compile it myself on windows. As discussed on Keebtalk, you have to pass additional arguments for dfu, or do the build and flash in one step.
I tried the build and flash, passing make hs60/v2:ansi:dfu-util
Build seem to go, .hex was created but an error (probably because I don't think I had it it flashing mode) and qmk toolbox said "invalid dfu suffix signature"
Flashed the .build/hs60_v2_ansi.hex onto the PCB, which apparently was a bad decision.
Now I can't use it at all. Mac doesn't see it. Windows says USB malfunction.
I tried to reset but (hold esc, plug, unplug, release esc) but windows just sees it as a malfunctioning USB device. Idears?