Hello, dear friends! I need help with BIOS mod for Z370 Maximus X Hero motherboard and QTJ1 CPU.
At the moment I tried to make a bios mod myself. Unfortunately I couldn’t run the QTJ1 cpu on the modified bios, although the old i7-8700K started without any problems! I even transferred all the additional data from the original BIOS dump, but it still didn’t help. 
maybe the problem is that the latest current BIOS (2701) for my motherboard is not suitable for these purposes? Thank you!
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Hello
I have a Maximus X AC, the BIOS is write locked, you won’t be able to update via AMI or conventional software methods without using very risky methods.
You must update its BIOS with a CH341A burner, I have a file ready and optimized for QTJx, I will try to attach it here in this answer for you.
(Just to reinforce that the file is for the AC WI-FI version, but I believe it is compatible with the non-wi-fi version, after all only the wi-fi module is added)
Best regards!