Thunderbolt Ethernet isn't working on OSX 10.7.5 MacBook Pro

I can't get my Thunderbolt Ethernet port working with my MacBook Pro running OSX 10.7.5. The Network Preferences shows the Display Ethernet as "Unknown Status".
I think I need the latest Thunderbolt firmware update (1.2.1), but it won't install on OSX 10.7.5 (says it requires 10.7.4).
Any ideas how I can get this working?
Thanks,
- Matt H

That wasn't me (questioner) saying it should work - it's someone else.
@clinton - note that I posted what OSX version I'm using in the original question. This is a KNOWN problem with the Thunderbolt display, with an available patch. The problem is that the patch will NOT install on OSX 10.7.5 - it refuses, saying you need 10.7.4.
So I see possible solutions as A) getting a patch that will install, or B) Getting it working without that patch.

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