@Maverick923 If CoffeeTime won't read the backup then you should dump the BIOS chip again, I would suggest using EFIFlash from a DOS bootable USB stick.

Once you have a complete dump of the BIOS you should be able to edit it with CoffeeTime v0.99 and flash it back to the board with the moddified version of EFIflash in DOS.

As your mobo has an Intel Gigabit LAN adapter you should make sure to save its MAC address somewhere safe before you attempt to flash any modified BIOS.

Note that the GA-Z270X-Gaming 7 has 'DualBIOS' so if your BIOS mod is bad or the flash fails for any reason (and corrupts the main BIOS chip) the board will automatically attempt to boot from the backup BIOS chip (and may not tell you that this has happened) - so be careful not to flash the backup chip if this occurs or you will need a programmer to recover both BIOS chips.