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  • matty
    Participant
    #1413562

    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?

    Same thing is happening

    It’s the EFI folder you have, we are working on a new one as we speak to go to Monterey, for now, it’s only Big Sur.

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