Here is the one that has been one the wiki for a while now and it does work.
just don't use it to make a otherOS++.pup or MFW to downgrade with as it won't work after it has been altered the token has changed and it will error. so to get back to a MFW you will need this
http://www.ps3devwiki.com/files/firm...Data.355.001d/
and then also a mfw to upgrade to if you want peek/poke.
hope this helps