I know the notebook is a little old, but i wanted to share my victory on installing macOS High Sierra on my laptop.
Had to change mini pcie wifi for this one: AzureWave AW-CE123H / 802.11ac/n/b/g + Bluetooth 4.0 / Half-Size PCI-Express MiniCard...
I do have a GA-Z77-DS3H. Its my other rig and the picture on my first post is from it.
Maybe you have a differen revision, upgraded board.
And yes im still using it with 10.12.
Theres a little app called imessagedebug install and then write what you see.
Edit: If you see null on your BSN or ROM then there's a problem with your numbers. Have to make sure everything is correct.
I have 2 systems and both do the same, weather I plug in an usb, move the mouse or type a key, systems will turn on.
I think it has to do with GA boards.
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