Why does Thunderbolt Update 1.2 keeping downloading?

YES!!!!

This did solve my problem. Tried a few reboots and connected / disconnected my TB just to make sure. After SMC reset the annoying failing update went away. Though the Firmware Version is 22.2 not 26.2.... Hmmm... whatever. Let's see if the annoying update 1.2 ever comes back.

...now, where is this "This helped me" button? @bediddleby's answer seemed to clear out my problem. at least for now.

Thanks!

Errr... I take it back. SMC did not help. A few days later the annoying TB 1.2 update is back. No cure so far...

So, your firmware shows as 22.2 and not 26.2 still? Then the update never applied. The update is correctly coming up then because it sees you don't have it. Do you get an error when applying the update?

Does not say what the error was. Never does.

But after I did SMC reset it just went away. After a few days it came back again. I have filed a bug with Apple and send them all the required system dumps. Never heard back from them...

So if you attempt to install the update, what happens? Does it appear to do it? Does it reboot your Mac? Mine would always tell me that the update failed - either without rebooting, or if it did reboot, the failure message came up afterwards. Did you download and try the manual update found here?

Thunderbolt Firmware Update v1.2

If that doesn't work, do you get an error?

Finally, did you do both an SMC and PRAM reset? I didn't mention it, but keep your laptop open the whole time and work from its screen rather than in clamshell mode where the Thunderbolt is your only display. I'll summarize the whole process that was successful for me here:

1. Shutdown laptop, disconnect everything except power. If any other Thunderbolt devices are attached to the display, disconnect them.

2. Open laptop, and do the SMC reset.

3. Do the PRAM reset.

4. Boot laptop (still with nothing attached except power.)

5. Connect Thunderbolt display but leave laptop open (as primary screen).

6. Install the update.

7. If successful, it should reboot your laptop and you'll get a progress indicator (though it doesn't actually say anything about the firmware update.)

8. It reboots again normally.

9. Check firmware, should be 26.2 for the display.

10. Reconnect any other Thunderbolt devices to the display, if you had any.

If that doesn't work, then the problem must be different than mine. Good luck.

Manual update tells me that: "Your computer is already up to date."

Thanks for the detailed steps. But that did not help either. My MacBook is the first generation Retina, and was updated to Mavericks and then to Yosemite. Problems started with update to Yosemite. TB is not the only problem unfortunately, there are others (outside of this thread)

Same problem for me... Annoying. Did all the resets, tried the manual install, just getting "your system is up to date" but firmware still on 22.2

MacBook Air (13-inch, Mid 2011)

Do not know if this makes (have made) any difference but I have re-ran the steps show by @bediddleby, only this time I followed it more closely, in particular the step 5 Connect Thunderbolt display but leave laptop open (as primary screen), the only step I did not do the time before. The difference was that this time the installer prompted me to re-boot the system. And when it did it actually ran an installation of some sort, and after a reboot it took it's sweet time doing something... Anyway. the Firmware is now 23.4, not 22.2. The update prompt has not been back. But I have been fooled before. Let's see if it comes back in a few days...

And... that did not do the trick.

The TB update is back. It shows up when there updates for other soft available.

This worked for me, thanks very much for posting your solution @bediddleby. This issue was driving me crazy.

This firmware upgrade seems to have rectified my TB display's "won't wake up from sleep" issue as well. Fingers crossed...

Nope, same result. Interestingly under the "Updates installed in the last 30 days" section it shows the update as installed... but its not 😟

All,

I have a Late 2012 27 inch iMac Yos 10.10.1 and have tried all of the fixes listed to no avail. The update says its installed on the manual update, but the app store screen looks as depicted above. Any other thoughts?

v/r,

KDubz78

So far no definitive fix.

In some cases it may go away for a few days, giving the user an illusion that all is well, but then comeback once some other app on your Mac needs update. I have a bug report open with Apple. They have no provided any fix or any suggestion or work around that works yet. We are still waiting.

Just connect your device to a power source when installing the update!

My laptop is ALWAYS connected to a power source. Including the times when I tries running updates. That does not help.