When I updated my MacBook Air (5,2, mid-2012) the installation got hung up and it started chiming as if there was a memory issue… I have attempted to run AHT, and either option-D or D get "Cannot Load EFI/Drivers/Testsupport.efi" Apple Support either did not know what that meant, or that it was caused by my third party (OWC) SSD. Tried the GitHub site to no avail (both loading and/or booting from a USB). My apologies in advance if this is reinventing the wheel…
Can’t Load Apple Hardware Test
apple-hardware-test
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Best Answer
I would manually download the AHT for your MBA and run it from a USB. The steps to do this are as follows:
AHT
when you're erasing it.In the Terminal window, enter the following:
cp -r /Volumes/AHTCThree/System /Volumes/AHT/
Now we need to make the USB flash drive bootable, so enter the following line in Terminal:
sudo bless --folder /Volumes/AHT/ --file /Volumes/AHT/System/Library/CoreServices/.diagnostics/diags.efi --label AHT
Enter your Admin password
Leave the USB flash drive plugged in and restart your MBA
Immediately hold down the Option key
Select the AHT from the list and boot up
NOTE for other readers: - The AHT download and Terminal commands used in this answer are only for Mid-2012 MacBook Air models (both the 11" and 13"). Do not attempt this if your model Mac is different!