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High Sierra won't boot after BIOS update

Joined
Oct 7, 2014
Messages
40
Motherboard
ASUS X99-A/USB 3.1
CPU
i7-5930K
Graphics
GT 740
Mac
MacBook Pro
Mobile Phone
iOS
I had a working X99 working setup with 10.13.5, but after an flashing my ASUS X99-A/USB 3.1 bios from 3902 to version 4101, my boot process began to stuck at this point:

IMG_2538.jpg


after a considerable wait, the GUI is somewhat display in the form of a sole cursor in the top left corner:

IMG_2539.jpg


after that, the boot process doesn't get any further.
I've tried flashing the original 3902 BIOS version and restoring all the settings, but to no avail
any ideas?
 
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