I'm not familiar with this laptop in particular, but just a guess based on what I've seen on other machines:
When USB booting, is there is option to boot from EFI file instead of from USB? Some UEFI models I've used require manual navigation to 'boootx64.efi' or else they display a blank screen.
Good luck!
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The other thing is the arnoldthebat build doesn't support your hardware configuration.
I know that newer amd cards require a different newer generation of amd cards and that arnoldthebat's build has either the older or newer drivers included but not the one that your machine needs.
If you can't get the machine to boot by playing with your bios, you either need to contact arnoldthebat about it and see if he will help troubleshoot it, or build your own chromiumos image that has a proper kernel configuration, and drivers(proprietary or opensource) for your device.
Youll either have to request support from arnoldthebat (no gaurentees he'll do it) or build your own from scratch.