Wait a few seconds and restart the computer.Unplug the power cord, wait for about 15 seconds, and plug it back in.To reset SMC on a desktop computer with the T2 chip: While holding the keys, press and hold the power button for another 7 seconds.Press and hold Shift + Ctrl + Option for about 7 seconds (make sure the cable is plugged in).Wait until your Mac restarts and try reinstalling macOS Big Sur.Īpple also recommends resetting SMC on laptops and desktop computers with the T2 security chip (you can check whether your Mac has it by accessing the Apple menu > About This Mac > System Report > Controller). ![]()
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