Big Sur update failing
My 2020 i5 Macbook Pro is on 11.0.1 and will not update to a later version (currently 11.2.2 being suggested).
It sets off updating, looks fine but then restarts still at 11.0.1.
MacBook Pro
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Are there any third part AntiVirus Applications installed that could interfere with the update? If so Remove as per Developers Instructions - If - No Disregard.
Try Re-Start in Safe Mode - Shift - immediately at startup. Does a Repair Disk, clears cache files and loads only Apple Software and Fonts.