Thunderbolt FW update not sticking

Hi all,
I've got a strange problem with my 27" i7 2011 iMac. I installed the Thunderbolt 1.0 Firmware Update via Software Update a while ago, but Software Update still sometimes thinks it's not installed and offers it again. When this happens, the Thunderbolt page in my System Profile comes up blank. If I then reboot the iMac (without installing the update again), Thunderbolt starts working and Software Update reports that I have no new updates available. Then, a few reboots later, Thunderbolt disappears again.
Anyone got any ideas what might be happening? The only potentially relevant detail I can think of is that this iMac's HD was cloned from another one that got returned because of a fault.
Cheers!
J

I had a problem with the update - after the update was complete, neither my Thunderbolt Display nor my Thunderbolt hard drives were recognized.
I had to reset the SMC -> http://support.apple.com/kb/HT3964 - a couple of times before everything was back to normal.
Give it a try - let me know if it works.
Clinton

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