downgrading psp firmware from 2.71

Anyone have any experience doing this? I want to access homebrew apps, etc, and I've noticed there's more than one downgrader available. Just wondering if anyone has done it so I know which is a good downgrader to go with

don't use that link unless you have anything highter than 2.8

I had a 2.71 with TA-082 mobo and used this:
http://forums.maxconsole.net/showthread.php?t=42069

Make sure you read through the thread. The OP goes through it step by step with this newb, and I think he uses slightly different files for that.