I have a 3GS on 3.1.2, Sprit, blackra1n unlock, SHSH blob saved on Cydia I have put off moving up to 4.x until now (since JB is out). Just for sanity check, my understanding is I can simply sync and upgrade to the latest 4.0.1 from itunes normally, open mobile safari to jailbreakme.com to jailbreak and that's it. I can still unlock with blackra1n from Cydia. long time jailbreaker here but this new method is almost TOO easy that I want to make sure I am not missing anything here. If someone can quick reply with a simple YES (there is nothing else I need to worry about) or NO (I missed something) I would appreciate it. Thanks a bunch! p.s. I haven't update my iTunes to the latest. I am still on 9.1. Is it ok to do so? Could be wrong but I remember reading a while back not to update so I haven't.