This update is intended for the Apple Thunderbolt Display (27-inch) only. Follow these tips to successfully install the update:

Hi, same problem with my late 2012 MacBook pro and my new (and working great in el cap) LG UltraWide 29UM58. I want anyone else who has this combo to know that the SwitchResX fix did not work in my case, so just keep in mind that YMMV.
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Make sure that your computer is running OS X Mavericks v10.9.4 or later.
Directly attach your Thunderbolt display to your computer's Thunderbolt port, or a port on another Thunderbolt display, using the built-in cable.
Connect no more than two Thunderbolt displays during the update.
If you’re using a MacBook Air or MacBook Pro to run the update, make sure that the computer's lid stays open. 'Closed clamshell' mode won't allow the update to install.
Plug your computer in to AC power.

You should see a message telling you what to correct if any of these requirements aren't met. Java se 8 download mac.

Testing conducted by Apple in October 2020 on production 1.4GHz quad-core Intel Core i5-based 13-inch MacBook Pro systems with 8GB RAM, 256GB SSD, and prerelease macOS Big Sur. Systems tested with WPA2 Wi-Fi network connection while running on battery power, with display brightness set to 12 clicks from bottom or 75%. I had a similar problem: The 'Thunderbolt display firmware update 1.2' kept reappearing in AppStore, even though the uppdate seemed successful. According to Apple1 the update was successful when the the Firmware Version is 26.2 and the Port Micro Firmware Version is 2.0.7 (visible in About this Mac - SystemReport).

When you run the update, your computer restarts, and you see a gray screen with a status bar. If you have multiple displays, only one display illuminates and shows the status bar. The more displays you're updating, the longer the update takes. The process can take several minutes to complete. If the display you're updating is the primary display, the screen might go black for up to a minute before the update status bar appears.

Important: Be sure not to disconnect or shut off the power on your computer or display during this update.

Follow these steps to make sure that the update applied successfully:

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Choose About This Mac from the Apple () menu.
Click System Report.
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.