Issues with Intel Arc B580 and LGA 1151

[darksonic300]

System

• Motherboard: ASUS Prime H270-PLUS
• BIOS Version: American Megatrends Inc. 2001, 14/07/2021
• GPU: Intel Arc B580

Description

Basically I've been trying to patch my system for a few days. BIOS flashing seems to work fine, but generally I fall into these 2 issues:

• Setting ReBar to 4+GB boots up the system, but GPU fails with Code 12.
• Setting ReBar to anything lower fails to post instead.

4G encoding is enabled and CSM is disabled.
I've also looked at a few github issues and discussions of people with similar issues, but couldn't find anything actually conclusive. I will note I have 32 GBs of RAM.

What should I do?

[darksonic300]

Currently I've done both UEFITool and MMTool methods, resulting in the same results. I've applied UEFIPatch.

[Koekieezz]

Currently I've done both UEFITool and MMTool methods, resulting in the same results. I've applied UEFIPatch.

Do you still have your original bios dump? please share it here :)