[REQUEST] Lenovo Leigion Y520-25ICZ Desktop advanced/hidden menu unlock

Hello,
can you unlock the hidden menu in this BIOS?

The BIOS is very limited. I want to change the temperature settings for the CPU, because its very loud in idle.
I also want to try if I can change some BIOS settings to make SpeedFan detect my fans.

Maybe it´s worth to mention that I booted from Linux and found an efivar named "OA3BackDoorVariable", but I am not sure if I can flip the bit or if I will brick my PC. Can I maybe try this?

Here is the link to the current BIOS: https://pcsupport.lenovo.com/us/en/produ...IOS%2FUEFI

Thank you very much

Edit: I added the .bin-file from the setup. I flashed the BIOS with this file.

  IMAGEO3U.bin (Size: 8 MB / Downloads: 3)