Guest sirroderick Posted June 12, 2022 Posted June 12, 2022 I've been trying for some time to upgrade from Catalina to Big Sur on Mac Pro (2009). The USB installer won't mount because it's not 'blessed'. TBH honest I'm not actually sure what this actually means but I have attempted it a number of times over the last couple of years and whatever the legacy patcher version I always come up against the same brick wall - the installer won't mount because it's not blessed. I have 3 Mac Pros and they all behave the same. It's very frustrating. Can anyone... Read more Source: MacRumors
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