Asrock P67 Extreme4 UEFI & Drivers thread [Extreme6 & Pro3 owners welcome]

[Ket]

New developments:

First on the advice of unplugging anything to check if the issue with hanging with 3.XX will disapear. There is only the mouse and a wi-fi dongle. I unplugged them and.. same hangs. So, I abandon the 3.XX until those problems are figured out.
The interesting is the development in the problem with the two errors "error! system cannot get fw version!" and "heci pointer mismatch" ater the rollback from 3 to earlier. In the meantime of the fore-mentioned experiments I was with V.2.1, and decided to manualy downgrade the Intel management engine interface driver in windows, just to see what will happen. I was with 7.1.40.1161, which I downgraded from 8.0 earlier. Deleted the old one and Windows installed automatically ver. 7.0.0.1114. Then I flashed uefi to v.2.1H - I already tryed that version, but now just decided to stay with it for now. Restarted, the system turned off, turned on, posted, shuted down again, posted again and after the post screen updated the ME on the rom chip, restarted again and... no more errors with 2.XX uefi. I can't repeat the exact procedure, but obviously it is possible to rollback between 1.xx, 2.xx and 3.xx without errors. After loading windows I noticed, the ME driver version is updated to 7.0.0.1118. Now I have completely normal post and OS loading without any errors. Just a small glich - the mouse directions in uefi are turned upside-down, but don't care. Now Im clocking back.

Thats why I suggested flasing the UEFI from pure DOS with the first release UEFI Doing that will "kick" the flash process into downgrading the MEI (or it should do as from pure DOS a complete ROM erase-rewrite happens) so when you then upgrade to the latest UEFI the MEI should also be updated properly. Cases like this are why I keep prodding Asrock to have a backup ROM chip, but thus far its not happened so its always a good idea to have a spare ROM chip handy to just switch to.