AORUS z590i ULTRA itx weird OEM Bios

[igor244]

Hey guys, I bought a prebuild Aorus model S. It is from gigabyte and of course I opened the thing and saw, that they use their AORUS ULTRA z590i ITX mainboard. But the weird thing is, that it idendifies as "AMS Z590" in CPU-Z and the BIOS itself. Also, there a no options for overclocking and the good stuff. It seems like this is a normal AORUS Z590i ITX but with a custom BIOS with all the good stuff removed. Updating with the newest z590i BIOS gives "invalid" error...

I upload here the Backup BIOS from the Mainboard, created with the flash utility.
  AORUS_model_S_backupBIOS.zip (Size: 9.42 MB / Downloads: 0)

Could someone check the BIOS an see whats the matter with it? Maybe unlock / change it to the normal z590i AORUS bios? 
Maybe it would be possible to flash the Z590i BIOS via a modifies EFIFlash?

Thank you very much!