Jailbreak iphone iOS 4.2.1with Redsn0w 0.9.7 Untethered jailbreak Released.here is how to do it.

Jan. 2, 2011 - PRLog -- The iPhone Dev Team has just released his "backup plan" (redsn0w 0.9.7) to untethered 4.2.1 IOS jailbreak . The recent beta redsn0w will allow you to jailbreak (untethered) iPhone 4 , IPAD 4G and iPod touch on iOS 4.2.1

The release of Redsn0w 0.9.7]b1 who was just released to untethered iOS 4.2.1 jailbreak.. The tool is part of the iPhone Dev Team is a beta tester of the program, it is recommended that you back up everything before starting the IOS to jailbreak iphone 4.2.1 with the legacy Redsn0w 0.9.7b1.

Before diving into how-to instructions,, make sure you have prepared for you with the following requirements:
1.   Stay away from Redsn0w 0.9.7b1 untethered jailbreak if you are relied on unlock using Ultrasn0w.
2.   iDevices (for iPhone 4 & iPOd touch 4G only) using iOS 4.2.1
3.   Have SHSH blobs saved for iOS 4.2 Beta 3 for your iDevices
4.   Access to iOS 4.2 Beta 3 firmware file (Developer only.
5.   iOS 4.2.1 firmware, iTunes 10.1.1 and of course a Redsn0w 0.9.7b1


The best thing about this "backup plan" is that it does not require that you restore or re-jailbreak your iPhone, iPhone or iPod touch.

Here’s detail with screen print how to do it.
http://www.fasterpony.com/jailbreak-ios-421-untethered-re...

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