Description Of Issue
Yesterday i install rock on my nuc.
Today i create a boot usb to replace rock with AN os.
I cannot boot from my usb device in any way.
Is it possible that the rock installaton mess up my boot loader?
I would not suspect that this issue is due to ROCK, I’d try basic hardware troubleshooting first - another USB drive, use another program to flash to USB OS, try a different USB port on the NUC, ect.