Installation Failures in 2.9 MacBook EFI Firmware Update 2011


If yesterday we informed you that Apple had released an EFI Firmware update for the Macbook Air from mid-2011 that solved the problems associated with the return of the machine from rest, today we echo that those of Cupertino have suddenly withdrawn this update due to serious problems that occur in its installation.

So if you are one of the users who had not installed it yet, stay out of it until Apple pronounces again. If instead you installed it, to return to the previous Firmware you will have to restart the SMC, which we tell you in this article.

Many are the users who have installed it and are reporting failures on their machines ranging from the computer starting to have random crashes to being totally unusable. Those of Cupertino have immediately withdrawn the 2.9 EFI Firmware update and for now they have not given any solution or communication in this regard.

As we anticipated, to be able to return to the previous Firmware you will need to restart the SMC (System Management Controller), for which you must follow the following steps:

Laptops with non-removable battery

  • You will need to turn off the computer, then connect the power adapter to a socket and then to the computer.
  • Now hit the keys Shift + Control + Option (OTHER) and press the power button simultaneously.
  • To finish, release all the keys at the same time and press the power button again.

Laptops with removable battery

  • You must turn off the computer, disconnect the power adapter from the computer if you have it plugged in and remove the battery.
  • Now press and hold the power button for five seconds then release it.
  • Insert the battery again and turn on the computer again.

Desktops (iMac, Mac Mini, or Xserve with an Intel processor and Mac Pro)

  • You will have to turn off the computer and unplug it from the power.
  • Now press and hold the power button for five seconds then release it.
  • We reconnect the power cable and turn on the computer.


Once again, if you are not sure about the steps to follow, go to an Apple Store or specialized dealer, tell them about the problem and let them tell you what to do.

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