This thread has me a bit worried. It sounds like there are some circuit design flaws which make the MCU vulnerable to damage effectively bricking the mount. I have one of these mounts showing up this week and now I am considering returning it.
I don't remember seeing this many problems with the ASGT even though it is basically the same design.
Anyway, I am not familiar with ARM based MCU's, but I did some research on ARM programming, and really the most useful page I found was sparkfun:
https://learn.sparkfun.com/tutorials/arm-programming/all
Also, I found this which is interesting:
https://www.nexstarsite.com/OddsNEnds/NoResponse.htm