Need to repair bootrom 144.0.0.0.0

[DF1979]

Hi all,

Need help. I believe my bootrom is corrupted. Have windows 11 installed using opencore legacy patch method. Windows did update and restarted. Now mac pro is not working properly. I attempted to install a Syncretic flashed rx 6600 xt and it seldomly boots to boot screen and when it does it is not recognized by either Mojave or Monterey. My bootrom is at 144.0.0.0.0. Any suggestions to install a clean bootrom 144.0.0.0.0? As far as metal cards I only have the rx 6600 xt which is finicky to bet to the boot screen.

Thanks

 

[saudor]

windows may have over-wrote the opencore legacy patcher in the EFI partition and you can lose the boot screen if you use a PC version of the card. Might be worth double checking to see if the EFI partition is intact (e.g. using a known backup USB)