Updated version of Redsn0w for iOS 4.1 final built has been released by Dev Team. Redsn0w 0.9.6b1 can jailbreak iPhone 3G and iPod Touch 2G on iOS 4.1. Redsn0w 0.9.6b1 is for MAX OS X users only. Windows version is currently under testing, it will take some time before Windows version is available.
Please note that if your iPhone 3G depends on Ultrasn0w unlock then stay away from Redsn0w 0.9.6b1 jailbreak, as it updates the baseband which is yet to be unlocked.
This is a beta release of redsn0w for the iPhone3G and iPod Touch 2G at FW 4.1 or 4.0. It uses the same pwnage2 DFU-mode exploit that we've been using since the 2.x days. It does not include the SHAtter exploit developed by pod2g. Nothing new is revealed to Apple with this jailbreak.
IF YOU USE THE ULTRASN0W UNLOCK, PLEASE WAIT FOR PWNAGETOOL TO SUPPORT 4.1. DO NOT USE REDSN0W. That’s because to use redsn0w at 4.1, you need to already have updated to official 4.1 from Apple. If you do that, you lose the ultrasn0w unlock (possible forever).
The procedure for jailbreaking iOS 4.1 with Redsn0w 0.9.6b1 is exactly similar to the procedure for jailbreaking iOS 4.1 Beta Release. Just restore your iPhone / iPod Touch to iOS 4.1 with iTunes and point Redsn0w at iOS 4.1 IPSW (final release). You can follow this step-by-step guide for jailbreaking iOS 4.1 (final version) with Redsn0w 0.9.6b1, make sure you point 4.1 ipsw instead of the 4.0 in step-5. Remember that this jailbreak will not hactivate your iPhone, moreover you might experience network problems after the jailbreak.
Download iOS 4.1 (Final Version)
Download Redsn0w 0.9.6b1 for Mac OS X
Update1: Jailbreak iOS 4.1 with Redsn0w 0.9.6b1 on iPhone 3G and iPod Touch 2G (Win)
Update2: Jailbreak iOS 4.1 on iPhone 4/3GS/3G, iPod Touch 4G/3G/2G & iPad with Redsn0w
Update3: Jailbreak iOS 4.1 on iPhone, iPod Touch, Apple TV & iPad with PwnageTool 4.1
Update4: Guide to Jailbreak iOS 4.1 & iOS 3.2.2 on Windows with Sn0wbreeze 2.1