Guest jeremiasm Posted November 19, 2021 Posted November 19, 2021 When I first upgraded my Mac Pro 5.1 (2010, one CPU) from High Sierra to Big Sur I managed to upgarde the bootrom succesfully (with a bunch of trying out, because then the Mac Pro won't shut down in Mojave installers bootrom update section) So I installed the BigSur 11.2.3 with barrykn micropatcher to NVME-PCIe card. I remember having boot problems and even having to install the os again because I got a stop sign. The shutdown / startup problems were even more complicated because of I... Read more Source: MacRumors
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