I was under the impression that you can't sbf backwards. So if on gingerbread you can't sbf back to froyo(something about mismatched kernal). I am froyo with the ota that came out between froyo and gingerbread, and rooted with Squidly 18.104.22.168. I am wanting to try CM7 real bad, I'm trying to read up now to make sure I do it right. Only rom I've had so far, just wanting to change up after months of running a very good rom.