- Joined
- Dec 19, 2014
- Messages
- 76
- Motherboard
- ASUS Prime Z390-A
- CPU
- i9-9900K
- Graphics
- RX 5700 XT
- Mac
- Classic Mac
- Mobile Phone
i done the same thing but forgot to put efi folder on efi partitionUnfortunately my primary rig is now in pieces in a box, since although it WAS working fine after the supplemental update, I made the it-turns-out-fatal mistake of simply CCC'ing my primary SSD to my backup SSD. Immediately the backup SSD wouldn't boot, i.e. entered repeated rebooting cycles. So I restarted on my primary SSD and guess what? It does the same thing. After two 10-hour days of trying to repair the damage, trying everything including swapping out a 10.12.6 SSD from my backup computer and trying to downgrade to Sierra, completely unsuccessfully, I gave up. I'm now on my backup computer (on 10.12.6) writing this, and I see no way out of this problem.