I've read articles about this and did in fact try going the Safe Boot route but to no avail. Since Apple states his iMac is compatible with Monterey, why won't it complete the update? I need to load a more recent OS since Safari no longer has compatibility with many of the financial websites he uses and High Sierra no longer gets security updates. I finally gave up and reinstalled High Sierra via his backup drive. There is no indication at this point if anything is happening or not I did this with Catalina too, got the same results. Pressed the power button to restart it and got the black screen with the install progress bar and said it had about 26 minutes to go so I let it go but the same thing happened when it got to the end of the progress bar. It stayed at less than a minute to complete for a good 30-40 minutes until I finally shut down via the power button on the back of the iMac Got the typical install screen and progress bar and let it run.takes around a half hour or more as the progress bar moves to the right to the end of its travel and then sits there with less than a minute to complete Ran Disk Utility to verify there were no issues with the internal hard driveįound a link to Monterey on the Apple App Store (you can no longer find it by searching the App Store, it appears they have taken it down but you can find a link directly to it)Äownloaded the install Monterey app, it was something like 45gig if I recall I updated my wife's mid 2015 MBP to Monterey without any issues so thought I'd do the same for my uncle. When that failed, I tried Catalina but met with the same fate. Update Hangs: Late 2015 21.5" iMac from High Sierra to Catalina or Monterey I'm trying to update my uncles 21.5" late 2015 iMac from High Sierra to Monterey which is supposed to be the last OS it will work with.
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