04-14-2018, 02:07 AM
I have another suggestion that I'll explain below.
HS works pretty well from a clean install. Make a good backup, erase your boot drive and install HS from a standalone installer vol (USB flash drive or external HD).
...And HS doesn't break target mode. It breaks installs via target mode. Because it does firmware updates during the install process and that's not gonna work in target mode.
Where you might get confused on the subject is when you try to connect a HS Mac to a Mac running an older OS via target mode. If the HS Mac has a APFS boot vol then it won't mount.
HS works pretty well from a clean install. Make a good backup, erase your boot drive and install HS from a standalone installer vol (USB flash drive or external HD).
...And HS doesn't break target mode. It breaks installs via target mode. Because it does firmware updates during the install process and that's not gonna work in target mode.
Where you might get confused on the subject is when you try to connect a HS Mac to a Mac running an older OS via target mode. If the HS Mac has a APFS boot vol then it won't mount.