I have an external 500GB SSD that I’ve gotten my iMac 17,1 system up to Monterey, and it goes through the motions of installing Sequoia (also Monterey and Sonoma), but after the hour-long update and a reboot it is still showing Monterey.
The original 1TB Fusion Drive bit the dust years ago so I have been running Big Sur on an external SSD without problems — it just won’t update properly past this version.
I’ve elected to adjust the OpenCore settings to alias my 17,1 iMac to a more recent iMac 2017 18,3 so that Apple does not give me an update non-compatibility warning.
Other than the system going through the motions but not completing an upgrade, the SD card slot is not being recognized, neither are additional USB external drives (however the keyboard and mouse are recognized fine).
My sense is because I don’t have a working Apple internal drive the OS upgrade is refusing to work properly.
What else can I try?
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