Jailbreak iOS 4.2.11. Download iOS 4.2 ipsw corresponding to your iPhone, iPod Touch or iPad here.2. Download Redsn0w 0.9.6 b4 for Windows or Mac from Hotfile here.3. Open Redsn0w and point it to the downloaded iOS 4.2.1 ipsw file.If you have pointed it to the correct file, it will show something as given above. Click next5. At this point you need to check Install Cydia option and proceed.6. Press Power OFF button and enter into the DFU mode. Just follow the steps given in the Redsn0w 0.9.6 b4 UI, if you are not sure about this.7. Redsn0w 0.9.6 b4 will now install iOS 4.2.1 jailbreak files in your iPhone, iPod Touch or iPad using the Limera1n exploit.8. If your are on an iPhone 3G, iPhone 3G S ( old iBoot ROM) or iPod Touch 2G ( model not starting with MC), steps to your untethered iOS 4.2.1 jailbreak completes here. Cydia should be there in your Springboard.9. As said earlier, Redsn0w 0.9.6 b4 is a tethered jailbreak for iPhone 4, iPhone 3G S ( new model), iPad, iPod Touch 4G, 3G, 2G (MC) and iPad. So even a jailbroken device in this category should use Redsn0w again and boot it to the tethered jailbreak mode.After that you can access Cydia, or SSH into the device. A non boot-tethered device will show a Grey or White Cydia icon instead of the bright one.
Unlock iOS
As the Dev Team promised to launched the updated version of Ultrasn0w on Sunday they did exactly what they said. The updated version of Ultrasn0w has been released which can unlock the iOS 4.2.1 and 4.1 iOS of devices like iPhone4 and iPhone 3Gs/3G. It can break all the basebands later than 05.13.04. as we all know.Here is the Step by Step guide to unlock iPhone 4,3GS and 3G using Ultrasn0w 1.2STEP 1: First of all to unlock your iPhone, your iPhone must be jailbroken on 4.1 or 4.2.1 iOS with baseband 06.15.00. To learn about this step, click on the link given below.
Complete Guide to jailbreak iOS 4.1 or 4.2.1 and updating iPhone 4,3GS and 3G to 06.15.00STEP2 : After the most important step of jailbreaking, you are now in the position that you can unlock you iPhone on any baseband with the help of Ultrasn0w


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