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ardaniels Author

Level 1

0 points

Monterey on 13" retina early 2015

Denied upgrade because firmware not compatible. Disk is expanded to Terabyte

MacBook Pro 13″, macOS 11.6

Posted on Jan 17, 2022 1:36 PM

Top-ranking reply

steve626

Level 6

11,561 points

Posted on Jan 17, 2022 3:45 PM

Part of the Monterey upgrade includes a firmware update. That firmware update requires that an Apple-brand internal drive be present. If you instead have a non-Apple drive present, the update will not complete. The only solution I have seen for this is to replace the current drive with an Apple-branded drive (most people use their original Apple drive for this), install the upgrade including the firmware update to get the firmware update applied, then switch back to your current drive and then try again to perform the upgrade to Monterey.

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Monterey on 13" retina early 2015

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