Have you guys managed to fix the shutdown/restart issue? I have the exact same motherboard and I still have issues getting the bios to post after shutting down the machine. I then have to clear cmos to get it to boot again.
I have tried pretty much everything at this stage. Using the USB mapping kext provided by OP doesn’t seem to do anything. I disabled the LED controller in bios and no luck either. That’s a really odd one :/