What I did was I booted from a 10.12 intall USB then proceeded to install 10.12 to a newly formatted HFS+ external USB drive. But that was the problem! It was a relatively easy fix and I didn't loose any data. It was an educated guess after pouring through the error logs and researching.
As a final attempt, I deduced that somehow my iMac's firmware hadn't gotten updated to see the APFS mounts. My error was that the OS couldn't run the bless command on the APFS drive to mnkae it bootable. I tried pitchcircle's suggestion plus in a couple of different ways, applying it to the mounted volume, unmounted, by dev name, etc. To my surprise, it restart on my internal partition and since then, no problem, I reboot several time.ĭIsk info on this partition indicate that it is not bootable, but as for my MacBook Air with SSD, so this flag seems useless. So I plug an external USB drive and install Beta on it, then restart. Before that, I engage a procédure to backup my partition but was not able to make disk image of the partition or even of a folder within this partition. So, only possibility will be to format the disk in HFS and install Beta again. Reason was: impossible to add boot information on this partition or something like that (don't remember exactly). When you install High Sierra Beta, you don't have the option to convert in APFS, so after installation, I reboot in recovery mode and use disk utiliy to convert my boot partition in APFS (I have 2 partitions on my internal drive).Ĭonversion was fine but impossible to reboot in normal mode, only recovery mode reboot. I had the same problem as fran22431 with my 2009 iMac. I suppose it is a HDD drive as 2009 iMac don't have internal SSD drive.
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