Files. Dev-Team Blog. Snowbreeze (sn0wbreeze) v 2.1 Jailbreak Guide for iPhone 4 – 3GS – Apple TV2. How To Jailbreak Your iPhone 4, iPhone 3GS or iPhone 3G Using PwnageTool (iOS 4.1) – iPhone Hacks. iPhone Dev Team has released PwnageTool 4.1.2 to allow iPhone users to create and update their iPhone with a custom pre-jailbroken iOS 4.1 . This guide will provide iPhone 4, iPhone 3GS and iPhone 3G users with step-by-step instructions to update and jailbreak their iPhone with iOS 4.1. Don’t forget to backup your iPhone before you proceed. You can refer to this post for instructions on how to backup your iPhone. Please ensure that your iPhone has enough charge. How To Jailbreak Your iPhone 4, iPhone 3GS or iPhone 3G Using PwnageTool (iOS 4.1) – iPhone Hacks.