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UEFI boot from external USB drives not working?

TimmeyCook

TimmeyCook

Suspended
Original poster
Jun 20, 2018
460
1,224
Hi, since DP2, I think, my external UEFI drives do not boot (no internal OS's besides macOS). I start with option pressed, the menus show up normally, but when selected, they don't boot, but the system boots to macOS without error message.

Is this just with me?
 
TimmeyCook said:
Hi, since DP2, I think, my external UEFI drives do not boot (no internal OS's besides macOS). I start with option pressed, the menus show up normally, but when selected, they don't boot, but the system boots to macOS without error message.

Is this just with me?
Click to expand...

Is not just you.. It's a known issue, I mentioned on https://forums.macrumors.com/thread...he-firmware-on-my-imac.2124330/#post-26181406. Spread the word so Apple knows about this and fixes it. Also, reverting back to High Sierra will NOT fix the issue.
 
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