Macbook Air 5,1 doesn't boot from USB stick

[mauricev]

I copied the DMG for the Macbook 5,1 Air to a USB stick and blessed with the label matching the name of the disk. It shows up under the option key, briefly displays some white on black text scrolling by too fast to read and then proceeds to boot OS and not the stick.

I was able to video the white on black text and see the error Cannot Load EFI/Drivers/TestSupport.efi twice at the beginning.

[mauricev]

I managed to copy it to .diagnostics and that also failed to work.