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  • Charles

    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.