Is there a way to reverse a firmware update?

Hi,
I did the firmware update
MacBook Pro EFI Update 2.1 This update includes fixes that resolve an issue with Turbo Mode in Boot Camp, and improve performance and stability for graphics and Thunderbolt.
It had broken my thunderbolt HDMI output, Apple say they can do nothing until a fix eventually come out and another firmware update.
Is there any way i can reset my firmware to factory settings or install a older version to un-do the problems this update has caused?
thanks

strange thing just happened, My HDMI thunderbolt cable dose not work with my samsung since the firmware update but it still works on other macs so it could not be the cable...
WELL just borrowed a friends cable and it now works perfectly, very strange and i can not explain it but try a new mini display to HDMI cable and it might just work for you too. :-)

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