Good news guys! I've managed to boot with F12 bios. It is easier than you think. Here is a simple step by step guide.
1. Make a boot drive with your current EFI folder.
2. Download
bootx64.efi and copy it to
EFI/Boot/.
This is some kind of alternative bootloader that starts with the command line. Here we will modify hidden BIOS settings.
3. Update BIOS to F12 (only F12!)
4. Reboot and hold F12 to boot from your Flashdrive. Now you should see this command line.
5. Now enter
Reboot from your primary drive. You Hack should boot normally. But don't forget to set up your BIOS settings.
P.S. If you are interested in the details:
0x5A4 is
CFG Lock option in BIOS
0x507 is
System Time and Alarm Source option
This codes are not static and can be changed in future updates. You can
use this guide to find this code for future versions of BIOS.