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Issue when I try to set an external ssd disk as bots me drive - sderrordomain error 104

K

karless

macrumors member
Original poster
Feb 10, 2013
61
9
Athens,Greece
I have an iMac mid 2015 and I installed Big Sur in external ssd , but when I try to set it as a bootable drive from settings I get this error , sderrordomain error 104.

Any advices ?
 
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