Hello, thanks so much for this.
I was wondering if since this post you'd had any experience or reports of people using this on a Z820?
I am considering it because I would like to have the NVME Boot but mostly for the ReSizeable Bar support so I can use the Intel GPUs
I am wary of wrecking the machine though
I tested the full write access procedure on Z820 - it works. You must have the newer Z820 motherboard with the E14 BB jumper to follow the procedure.
Have not heard about modded BIOS versions on Z820. I think the version cJ63_0396_NRE.zip has the least changes, and should be reasonably safe to try. But of course - the first time and everything ...