Home › Forums › Macs › Desktops › Mac Pro › OpenCore › Reply To: OpenCore martinParticipant2nd November 2021 at 6:30 pm#1413243Macpro 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?