Some have complained about the Z390 Master having coil whine. I have used nearly every BIOS version (F4,F5,F6,F7,F7a,F7b,F8,F8b,F8e,F8g,F8h,F9,F9b,F9c,F92,F10b,F10d, F10d-GK) offered by Gigabyte and have never experienced coil whine. I use the default C-State values and experience no coil whine.
I am using the i7-9700k. Your processor may be causing the issue or your system board may have a component out of specification.
BTW--I haven't tried the posted F10 BIOS.. Life is good with F10d-GK.
You need to use the EFIFLASH version with the OEM checks disabled.
Kedarwolf on overclock.net forums has it. You have to PM him for it because that version will flash **ANY** BIOS, even from another manufacturer! I have it too but I don't know how to send it to you.
I dont know if you need to use the command switch /NoOemID when you run it (at the end of the command, like, EFIFlash z390aoma.f10 /X /NoOemID
Or if you can just run it with eiflash (biosfilename.extension) /x
I had Bigdave's gk bios also and used that EFIflash to flash it to F10.