I searched the forums and didn't see what I was looking for so sorry if it's here and I missed it. Anyway, I'm not a hacker but have a 3G Jailbroken/Unlocked running T-Mobile. I have Blackra1n installed and would like to know if I can upgrade to 3.1.3 without having issues and just run blackra1n on the phone after the upgrade is complete. Or should I just upgrade to 4.0. I suspect I have the old bootrom. Thanks in advance for your help.