Jailbreak iPhone 3G with iOS 4.2 Beta using redsn0w 0.9.6b1 [Guide]

redsn0w 0.9.6b1 was released today by the iPhone Dev Team. It supports jailbreaking iPhone 3G and iPod Touch 2G with iOS 4.1/4.0 [MC and non-MC models as well] but also lets you jailbreak iOS 4.2 Beta [with bugs, though] if you have it installed. Since installing iOS 4.2 Beta requires a UDID, this guide should strictly be followed by developers or those who know what they’re doing. We’re not responsible for any issues that might occur. Also, keep in mind that there’s no unlock for iOS 4.2 Beta on iPhone 3G, so avoid this at all costs if you want to use your iPhone with different carriers.

1. Download iOS 4.2 and 4.1 for iPhone 3G. Place it on your desktop for easy access.
2. Download redsn0w 0.9.6b1. Available only for Mac currently.
3. Download and install iTunes 10.
4. Now connect your iPhone 3G to your computer and using iTunes, upgrade to iOS 4.2 Beta. This can be done using iTunes as described here.
5. You’ll have to jailbreak it by using iOS 4.1. This means that even though you have iOS 4.2 installed on your iPhone 3G, you must point redsn0w to iOS 4.1 firmware.
6. Click Next. You’ll be given some options. Just select Install Cydia and battery percentage. Multitasking and home screen wallpaper can be enabled later through a Cydia app.
7. Turn off your iPhone 3G and connect it to the computer. We’ll have to put it in DFU mode now. To do this, hold the power button for 3 seconds, and then hold the home button too without releasing the power button for 10 seconds. Then release the power button but keep holding the home button until redsn0w starts doing its thing.
8. Once redsn0w is done your iPhone 3G reboots, it will be jailbroken.

Download redsn0w 0.9.6b1 for Mac

Download iTunes 10

Download iOS 4.1

Download iOS 4.2

If you run into any issues or have any questions, put them in the comments below and we’ll be glad to help you out!