Try with MacBookAir9,1 SMBios and use the following Device Properties matched to your GPUs device path.
Thank you for that config.plist it works but the screen backlight is very dim while booting up and it takes about 3 to 4 minutes then the brightness comes back.
In About this Mac
Mac doesn't say the name of the MacBook Air
Processor says 1.19 Ghz Unknown
Serial Number Unavailable.
I used GenSMBIOS-Master to generate a serial number it was successful. It's not reflecting in about this Mac after rebooting.
in config.plist the serial number uuid is there except ROM.112233445566
im just trying to fine tune everything as best as possible