![]() ![]() If you’re having this issue and are trying to find the solution, scroll to the bottom of this post! I’m writing all the stuff below in order to attract people to this post that are having the same issue, because it’s a lot of us and I want to get the word out! Below I wanted to outline the typically suggested methods and why they didn’t work for me, and tell you what did work for me at the end. ![]() I tried every diskutil command in terminal I could find, and even tried some weirder things. I called Apple Support twice, and spent probably ~4 hours total on calls with them to no avail. I tried to debug this issue for about three weeks. I recognized something was supremely wrong when I tried to boot into recovery mode and try to manually mount the Macintosh HD - Data drive, but it wouldn’t accept the password I literally just used to login to my account. Sometimes instead it would just restart the machine, putting me back at the login screen. I would be able to “log in” in the normal user login screen and the password would be accepted, but then, upon logging in, I’d get the circle with a line through it symbol to indicate the machine couldn’t be booted. #MAC OS HIGH SIERRA TO BIG SUR INSTALL#It was also unclear if the system upgrade itself had failed or was still in progress, as when I would login it would act as if the upgrade was going, would show me a progress bar, and then at the end would loop back to the install screen. Because I used FileVault (never again?) on the drive, this meant that when the system was trying to access the Macintosh HD - Data partition using the passed in credentials from booting from Macintosh HD, the drive wouldn’t properly mount and hence I couldn’t boot the OS. The best I can divine about what happened is that, while doing its usual multiple restarts as a new OS is installed, somehow my drive permissions fell out of sync with my normal OpenDirectory login permissions. #MAC OS HIGH SIERRA TO BIG SUR UPDATE#I had a real bitch of a bug recently when trying to update my laptop from High Sierra to Big Sur. MacOS Big Sur Upgrade from High Sierra Failing Due to Mismatched FileVault (+ Fix) ![]()
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