Home › Forums › Macs › Desktops › Mac Pro › OpenCore › Reply To: OpenCore CharlesKeymaster23rd November 2021 at 9:45 am#1413991martin wrote:Macpro 5.1 ( mid 2010) RX-580, running Mojave fine for years on PCI slot SSD. The install for Monterey downloaded from the app store and the process begins but an error message about a firmware update cannot be applied quits the process. Any ideas?Hi Martin. Sorry we have not done much testing on Monterey yet. I would say for Monterey you are best using MartinLo’s package. Martin’s Package As far as I know you have to enable to VMM flag and turn off update SMBIOS to be able to complete the installation then swap back to the standard EFI.