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chmedly

macrumors newbie
Original poster
Sep 14, 2006
20
0
I had to step a 2012 MBP that was running HS with AFPS to a previous time machine backup that was also HS with AFPS (just a few days ago). Upon reboot I get the circle with the line through it. Tried it a second time. Everything seems to go fine except that the machine is not bootable when it's finished. I can run first aid on the SSD (in the 2012 MBP) either from recovery or by connecting from another (High Sierra) machine via target disk mode and it checks fine. So I decided to reinstall the OS and simply migrate the stuff in from the backup. But apparently you can't install High Sierra via Target Disk Mode! I guess I have to make a usb installer. What a drag....
 
Yep the ability to do this was removed, likely due to the way in which HS handles firmware, bootrom, etc updates. Easiest thing is keep an image of a fresh in stall of HS on APFS on a flash drive that you can restore onto machines as needed. only needs 7-8GB of space and saves the install time since you can just use ASR.
 
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