Related Article: If an error occurred while updating or installing macOS

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

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 5:28 PM

Reply
Question marked as Apple recommended

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.

Posted on Nov 16, 2021 5:38 PM

1 reply

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

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple ID.