I spoke with somebody at Apple Support, who was mystified, suggested maybe it had something to do with the SSD? The SSD seems to work fine otherwise, starts up okay etc., and DriveDx (which gives detailed readout of SMART parameters) says it is good.Īnybody have any idea what the problem might be? I plan to sell this MBP, but can't do so in good conscience as it is, even if it seems to be working okay otherwise. But it still "Cannot load 'EFI/Drivers/TestSupport.efi'". The MBP was showing other problems as well I sent it to a repair service, who said the GPU needed fixing (apparently common in this model), which they did, and said the logic board now tested all good. So the problem is definitely something in this MacBook Pro. The same hardware (USB stick for AHT, external HD or USB stick for ASD) works fine with four other Mac portables, and two of them can access Apple Diagnostic (the 2014 & later version of AHT) from the Internet as they're supposed to (the others are too old to do so).
So it seems this MBP is now somehow allergic to Apple's own EFI driver?
#Bootchamp error bless failed efi found driver#
However, MemTest86 (which also starts up from an EFI driver from a USB stick) still works fine with the MacBook Pro. I ran both AHT (Internet & USB) and ASD/EFI successfully a couple times only a few months ago something's changed, but I can't figure out what. I've reset the SMC and NVRAM, and reinstalled the OS (Sierra) numerous times, to no avail. The OS version of Apple Service Diagnostic works okay (it has an OS on it, and shows in the Startup Disk preference Pane), but the EFI version gives the same result as above. Same result when I try to run AHT from a USB stick, except this time it shows the above message twice – flashing by so quickly I had to get a video of it to see what it said – then immediately restarts into MacOS.
Which sits there for about five minutes, then it restarts into MacOS.
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