How to Mac Thunderbolt Firmware Update

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Follow these steps to make sure that the update applied successfully:
  1. Choose About This Mac from the Apple () menu.
  2. Click System Report.
  3. Click Thunderbolt in the list on the left and find the Thunderbolt Display section. The Firmware Version should be 26.2 and the Port Micro Firmware Version should be 2.0.7 after the update.
After installing Thunderbolt Firmware Update 1.2:
  1. Thunderbolt ports may not work.
  2. Target Display Mode may no longer work.
  3. The update may keep reappearing as available for download.
How to resolve
  1. Shutdown your computer.
  2. Disconnect all Thunderbolt devices.
  3. Wait 10 seconds.
  4. If you are using a Mac mini with a Thunderbolt display, reconnect the Thunderbolt display directly to your computer via the Thunderbolt port. Do not connect other Thunderbolt devices at this time.
  5. Restart your computer.
  6. If the Thunderbolt Firmware Update 1.2 is offered, download and install it and restart your computer when asked. If the Thunderbolt Update is not offered, the update has installed correctly.
  7. Reconnect all Thunderbolt devices.