Macbook Pro 2014 - update from Mojave to Big Sur - total failure - will not boot.

Tried to update Macbook Pro from Mojave to Big Sur. My machine is now unusable and will not boot. Hangs every time during update with apple logo and progress bar at about 35%.

Tried SMC reset, tried NVRAM reset, tried recovery mode, tried USB installer.

How do I get back to Mojave?

MacBook Pro 15″, macOS 10.14

Posted on Nov 16, 2021 05:28 PM

Top-ranking reply

Grant Bennet-Alder

Level 10

138,605 points

Posted on Nov 16, 2021 05:38 PM

Internet Recovery initial code is in ROM, with the rest downloaded from the Internet. If you invoke recovery, it does not need a functioning Disk drive to draw the starting up screens.

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Macbook Pro 2014 - update from Mojave to Big Sur - total failure - will not boot.

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