unable to verify Mac os

I have a MacBook Pro (16-inch, 2019) running, Big sir. I have been trying to update Venture for a while now still no luck. Keep getting the "unable to verify Mac OS" message with about 53 minutes remaining. Yesterday I erased the hard drive to have a fresh start, thinking this would help, but I Still got the same error message. Any help would be great.

MacBook Pro

Posted on Feb 14, 2023 5:34 AM

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1 reply

HWTech

Level 9

67,286 points

Feb 14, 2023 8:48 AM in response to nomac1972

Make sure all external devices are disconnected in case one of them is causing a problem. You can try performing an SMC Reset (the procedure is different for 2018+ Macs) and a PRAM Reset (hold for two chimes if possible).

Try to "Restore" the firmware which will reset the T2 security chip as well as push a clean copy of macOS onto the internal SSD. Unfortunately this procedure requires access to another Mac running macOS 10.15+.

Revive or restore an Intel-based Mac using Apple Configurator - Apple Support

If this does not work, then you will likely need to have Apple or an Apple Authorized Service Provider examine the laptop.

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unable to verify Mac os

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