HT203758: Thunderbolt Firmware Update 1.2: Keeps reappearing and Thunderbolt ports and Target Display Mode may not work

Learn about Thunderbolt Firmware Update 1.2: Keeps reappearing and Thunderbolt ports and Target Display Mode may not work
Erik Nordheim

Q: Thunderbolt Firmware Update 1.2 fails

Late 2012 27-inch iMac Thunderbolt Firmware Update 1.2 fails

 

From the Mac App Store, I click the update to install the Thunderbolt update.  The mac restarts.  First it displays a status bar saying it's downloading the update, then it restarts and briefly displays a black and white status bar for maybe a second or two before restarting again.

 

The Mac App Store shows that my Mac still need Thunderbolt Firmware Update 1.2.

iMac, OS X El Capitan (10.11.5), 27-inch Late 2012 2.9 GHz Core i5

Posted on Jul 1, 2016 6:28 PM

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