How To Jailbreak iOS 4.2.1 Untethered

By Dunn • March 10, 2011

Chronic Dev Team had released Windows version of the Untethered Jailbreak for all i-device running iOS 4.2.1 using GreenP0ison RC5. This definitely is the good news for most i-device users especially iPhone 4 and iPad. So no more worry plugging in your i-device to computer on every restart or while it was running out of power and being forced shut down.

There are some important things that you need to know before proceed the untethered jailbreak:

This jailbreak is only for i-device running iOS 4.2.1. Other than that it won’t work. So if your i-device hasn’t running iOS 4.2.1, you have to update the firmware.

If you rely on factory unlock then don’t update to iOS 4.2.1 as it will also upgrade your baseband and will cause your iPhone or iPad losing their carrier unlock.
If your i-device already jailbroken before using Redsn0w, you can just proceed with below steps to make it untethered.

WARNING: Do this at your own risk. I am not responsible for any problems that may occur as a result of following this guide.

Download GreenP0ison
Connect i-device to computer via USB and run GreenP0ison

When you are ready, click “Prepare to Jailbreak” and follow the instructions on the screen to enter DFU mode.

If you enter DFU successfully, greenp0ison will start the jailbreaking process.
When it’s done, run the “Loader” Application to install Cydia

Next check out How To Download Application After Jailbreak

Categories: Apple, Download
Tags: GreenP0ison, How To, iOS 4.2.1, iPad, iPhone, Jailbreak, Untethered

9 Responses to “ How To Jailbreak iOS 4.2.1 Untethered ”

My Female Apr 19th, 2011 at 6:17 pm

Nice posts
first visit, greetings from me, hope you are willing to come to my blog

[Reply]
Andrew May 24th, 2011 at 10:56 am

Just did it, thank you!

[Reply]
Mike Jun 1st, 2011 at 1:23 am

Awesome, thank you! I’ve been waiting to do this.

[Reply]
JiMz Freebies Jul 14th, 2011 at 3:59 pm

many many thanks

[Reply]
Concept gadgets Jul 14th, 2011 at 3:59 pm

thanks a lot dear

[Reply]
Mayweather vs Ortiz Jul 17th, 2011 at 11:51 am

Thanks for the info admin, This definitely is the good news for most i-device users especially iPhone 4 and iPad.

[Reply]
Canon Printer Repair Oct 7th, 2011 at 10:40 pm

The founder of Apple just died recently, that news was very sad though the memories of this guy will still remain because of the gadgets he had created for us.

- Vins

[Reply]
Joe Anderson Nov 22nd, 2011 at 1:14 pm

Finally! I always wait to find a legit source before I decide to go through with any jailbreak. Thanks a lot!

[Reply]
Adam Brown Aug 8th, 2012 at 6:15 pm

Hi Dunn
Thanks for sharing this nice post !
This guide is really helpful for Jailbreak iOS 4.2.1 untethered.

Thanks again
Regards

[Reply]