hey man, I have an unlocked/unbranded desire, so have a different method than you, as you'll need to make a goldcard etc, and there is something about the simlocks with certain radio files... check lekky's guide to rooting and the 2.2 upgrade... my best advice is take your time with it, follow each step, and make sure you don't panic when it looks like it's all going wrong (the fone will restart a number of times and do all sorts of stuff you dont expect)... you'll be fine (although it is at own risk!)