[Request] Unlocking Above 4G Decoding on ASUS TUF X470-PLUS GAMING

Hi, I need help modding an ASUS BIOS.

I tried to flash the BIOS after modding it using AMIBCP but EzFlash refused to flash it as it said it was "not a proper BIOS".
I'm using an ASUS TUF X470-PLUS GAMING motherboard and all I'm trying to enable is the option for Above 4G Decoding.

Thanks.