I bought a cheap Durgod Hades with the intention of sticking the QMK/VIA firmware on it.

First issue was getting it into the bootloader - the instructions didn't seem to be working, so I was trying different connection points and implements until it finally kicked into life. In doing that I suspect I may have killed the STM32... but I'm not sure.

Using dfu-util I've tried :unprotect:force and :mass-erase:force to try and recover it, and also downloaded STM32Cube to see if I have more luck with that.

dfu-util, no matter what I do, hangs at the erase point 0%. Eventually it times out with an error.

STM32Cube connects to the keyboard but complains it's in read-only or reset held. If I try again with the suggested Read Unprotect option it says I need to power off and power on the device, and the cycle continues.

So I think I've somehow bust it, is there anything else I can try before admitting defeat and getting another one?