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You'll also need the iOS 4.2.1 software for your specific device. Once you have both of these things you can run the redsn0w jailbreak on the device with the greenpois0n jailbreak already...
Redsn0w 0.9.6b5 jailbreaks iOS 4.2.1 but also provides the added ability to install baseband firmware that can be unlocked for the iPhone 3GS and iPhone 3G. For other iOS devices, redsn0w 0.9.6b5 will simply jailbreak the device but some models will be a tethered jailbreak.
Follow our how to jailbreak iOS 4.2.1 untethered with GreenPois0n 1.0 RC5 guide if you need assistance. As usual, backup your iPhone before proceeding. If you are currently using a tethered jailbreak like redsn0w, you should restore before jailbreaking again with GreenPois0n 1.0 RC5.
greenpois0n is capable of jailbreaking every iOS device except the iPhone 3G on firmware versions 4.1, 4.2.1, and 4.2.6, as well as the iPad 1st Generation on version 3.2.2. greenpois0n is an untethered jailbreak meaning that it survives a reboot and can cause a permanent bootloop if something goes wrong. If you encounter a bootloop, restore ...
Learn how to Jailbreak iOS 4.2.1 untethered on Windows using GreenPois0n RC5 b2. Download GreenPois0n to jailbreak iOS 4.2.1 untethered on Windows in this guide.
This step by step guide will show you how to jailbreak your iPhone iOS 4.2.1 with RedSn0w. This tutorial was made using an iPhone 3GS but the steps are the same, no matter what device you are using…. Step 1: Make sure iTunes is updated to its latest version. Make sure your iPhone is on 4.2.1.
Greenpois0n RC5 now allows you to jailbreak iOS 4.2.1 untethered on most devices including iPhone 4 and iPad. The best part? You won't need any SHSH blobs saved. redsn0w beta required you to have 4.2b
This step by step guide will show you how to jailbreak your iPhone 4.2.1 with PwnageTool, a Mac only jailbreak for iPhone.
Step 1: Make sure your iPhone is on iOS 4.2.1 as GreenPois0n will not work with any other firmware. Step 2: Download GreenPois0n from our iPhone downloads section. Step 3: Plug your iPhone to your computer via the USB cable then launch GreenPois0n. Click on the “Jailbreak” button.
You can jailbreak iOS 4.2.1 with Greenpois0n, RedSn0w and Seas0nPass. All iOS 4.2.1 jailbreak guides for iPhone 4, 3GS, 3G and iPod Touch 4G, 3G and 2G can be found below. We’ll update this post as soon as a new jailbreak for iOS 4.2.1 firmware is out. So, bookmark this page for future reference.