Larkbox X 2023 stuck in BIOS loop


I tried installing Linux Mint last night and something went sideways. Now my Larkbox X starts up and automatically enters the bios setup screen. The system does not boot from the HDD and enters the bios setup screen. When I change the bootorder to USB first and try to save the bios settings and exit the setup the screen goes black and returns to the bios setup screen after approx. 3 seconds. I have tried various bootable USB devices and none are recognised.

Any suggestions?

Thanks in advance!