Ive been on 4.3.1 jailbroken for some time now. My phone is acting flaky and has started to tether on it's own when connected to a PC, so I am relegated to AC charging. Its time to format and fresh install. I need a jailbreak, can I re-install 4.3.1 by downloading the ipsw file and loading through itunes? Or can I get a newer version and use jailbreakme.com? I don't want to screw up cuz I know I will prolly only get one shot. Thanks!