You're right. Twice. 1) You missed some (significant) post and 2) it sure would be nice if you could have the choice to revert back.
But then, it still cannot be done. Search the forum, look for the first thread concerning the 1.31NA release. There's a kernel update from Ubicom (the router OS developer) that blocks a downgrade. It was discussed to exhaustion already, sorry, and the no-downgrade thing was loudly anounced.