[Q] ROM downgrade?

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Hi Guys
I purchased HTC 7 Pro 8 GB
Accidentally, I upgraded to NoDo version and now I cannot unlock with ChevronWP7 and manual unlock works only for LG as I understand.
So
Is any way to go back and downgrade?

Thanks in advance

When this happened to me I was able to use Zune to restore my backup and then I installed chevron, unlocked and installed the provvml hack for htcs and then updated again via Zune. Now it is unlocked with NoDo .

Or downgrade is possible with the help of instalation this rom http://forum.xda-developers.com/show....php?t=1013807

Moved to general as not rom development.

Thank you guys :) It really worked.