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big sur installation failed an error occured

iMac Line (2012 and Later)

Posted on Jan 30, 2021 7:44 AM

Top-ranking reply

PRP_53

Level 10

91,579 points

Posted on Jan 30, 2021 7:54 AM

Shutdown via Per Button and disconnect all external drives. Re-Start in Safe Mode - Shift - key immediately at startup. It will load very slowly - Normal. If all goes well, Big Sur will finish and be installed.

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big sur installation failed an error occured

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