Guest Joselita Posted February 11, 2022 Posted February 11, 2022 Hello ! I have a Mac Pro 4.1 . I flashed the firmware for installing high Sierra a while ago . Lately something happened that seems to have bring back the old basic firmaware and now computer goes only on R mode . How can I get my computer back ? Should I downgrade and how would I do that when the OS X base is high Sierra!??? Source: MacRumors
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