¿Ajustado correctamente para su CPU? Si es así, verifique nuevamente la configuración de su BIOS.
Can you check add one more GPU work or not? I stuck on dual-GPU 1080ti for a week. When only one plug in works perfect. but plugin the 2nd. booting for a long time to into the macOS.they can be seen, but GPU-Z.app or other gpu apps freeze.
modify ssdt no luck.
You will be fine. Even if you mess up flashing the patched BIOS (which is unlikely), ASUS boards come with dual BIOS chips, so you will have backup options. Also ASUS boards' BIOS chips are replaceable, so if you badly mess up your flash you can buy a $5 replacement chip off eBay and just swap it out.
Also you can find the latest releases of the UEFI tool here (https://github.com/LongSoft/UEFITool/releases/), although the link in the OP should still work with ASUS' latest BIOS version.