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Intel Core i5 de doble núcleo a 1,8 GHz (Turbo Boost de hasta 2,8 GHz) con 3 MB de caché L3 compartida

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Error Cannot Load EFI Drivers

2012 13" A1466 MacBook Air (OSX Catalina 10.15.7

The unit was running fine until sudden;y it didn't want to load OS on boot, just hanged for a very long time then shut down by itself.

So I ran the apple diagnostics test only to get at the top left of the screen :

Error Code 0x000000000000003 Cannot Load EFI/Drivers/TestSupport.efi

Status0x00000003

Also a topic Here & @danj who answered Here but provided no real solution that I can find, same Here. @oldturkey03 any ideas?

I have Reset NVRAM/PRAM & SMC countless times. Tried 2 different apple SSD's that are from 2 other 2012 MacBook Airs of the same year, model, OS and specs..... all have fresh installs of Catalina without any added software's. Tried with different batteries. etc etc..... I have been on this all day....So, IF anyone has a KNOWN fix for this it would be greatly appreciated. Driving me nuts.

UPDATE: Suddenly as if by magic I get to the create account setup but the system is very very laggy and everything takes much longer than it should.... The fan is a full speed all the time.... obviously something is not functioning correctly....

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You have the answer as pointed out in the links. Apple broke diagnostics and won’t fix it.

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@danj Yes, but how did it get broken when it was working fine 2 days ago? weird. Anyway, I am trying 2 new methods to see if that makes any progress....

Wiping the drive in recovery mode (show all devices & select the top layer, it showed 2x data volumes which is odd) and now installing Catalina on it. FAILED

Next, I will try to install on an external, then boot it on the problem unit and try to clone it over to the internal SSD but I doubt that will help much..... what would actually be the point in trying this?

I think it needs to get in the recovery mode on the unit in question to install the system and that way it will hopefully overwrite any codes that maybe on the board somewhere (Beyond me).... Failing these 2 methods, I will try in target mode.....FAILED in Target mode.... Need to use a similar age laptop to do this.... and cannot as all have Catalina of this age.... Looks like it is easier to just junk this unit for parts..... time is money as they say. will update.

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Trying without any luck so far to install every OS since Lion on it...... always the same results, it gets to the setup screens and is super slow and laggy....almost gets there then shuts down by itself. Seems nothing works and the unit has junked itself. Is this what is happening to other also?

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@danj It somehow by itself displayed recovery network mode!

I have one chance here, what to select to install as OS that will have a proper recovery mode?

Terminal command to download the OS it original it was shipped with or Catalina the last supported OS? Or what to do? The arrow is seriously lagging.... hard to do anything.....

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I tried booting from a HDD on a USB but it is still incredibly slow..... does this mean the unit is junked? What exactly is this issue and how to reinstall these needed drivers or whatever????

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The logic board needs repair if the trackpad, display and battery sensors are working correctly. Testing each line from them. In most cases the that is the issue. Next is liquid damage causing corrosion damage within the SMC logic and lastly a bad SMC chip.

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So it looks like a bad SMC chip, therefore will a replacement fix this?

There has never been any liquid damage.

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@livfe - While I’ve seen bad SMC chips I more often see bad solder joints on the chip as well as the other SMD devices which surround the SMD chip which is the inputs/output lines.


Using my trusty DVM and a set of schematics and board view drawings I make quick work isolating down the defective line, a quick reheat with a hot air rework station and good flux often solves it or replacing the small SMD device either a capacitor or resistor that has failed.


Just the act of replacing the SMC will also likely fix the issue as you are reheating the area, but at the cost of replacing a still working chip.

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@danj Yes agree, I guess it has to be looked at properly by a tech guy who can do the board work, because the chance of it being a faulty component that talks to the SMC confusing it is likely also. Will update.

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@danj Out of curiosity and it may sound like a silly question, but would force shutting down often cause this? Because the owner just let it slip they don't know how to shut down the laptop via the apple menu and always just pressed the power button until it went off...... nuts.

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@livfe - That might imply the system went into sleep mode then into hibernation if left in sleep mode too long. Here’s a good read on the different modes How to Choose a Sleep Mode for Your Mac. Without looking at the EFI saved variable you can’t tell what’s going on.

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