Chronic Dev-Team Releases Untethered Jailbreak for iOS 4.2.1 [Update]

Posted February 3, 2011 at 10:47pm by iClarified | Please help us and submit a translation by clicking here | 70262 views

The Chronic Dev-Team has just released the latest version of Greenpois0n, which features an untethered jailbreak for iOS 4.2.1 without the need for SHSH blobs. The exploit they are using has already been patched in iOS 4.3.

Currently it is Mac only and is a beta release. A Windows version will be released "soon." You can download the jailbreak from here or here

You can find our tutorials on how to jailbreak with Greenpois0n here:
iPhone (Mac)

We have been unsuccessful in jailbreaking using Greenpois0n due to the following errors that present on the iPhone. We will let you know when we've been able to jailbreak successfully. Don't forget to check out the new iClarified app while you wait :)
Unable to find gBdevList
Unable to find fs_mount
Unable to find fs_unmount
Unable to find fs_load_file

Posixninja reports that these errors are normal. Presumably, the procedure shouldn't hang at this point.

Update 2:
Partial success... Make sure to do a clean restore and to keep holding the home button until Greenpois0n tells you it has completed. Unfortunately, now Cydia is not appearing in the Loader app. This may be because of server overload.

Update 3:
Success :) After numerous attempts at reloading Loader. Cydia has appeared. Servers are likely being slammed and download is taking forever.

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capitanloria - February 6, 2011 at 5:45pm
The Camera icon went out after jailbreak and once the iphone was up and running... any ideas???
capitanloria - February 12, 2011 at 1:55pm
any ideas somebody???
anony - February 6, 2011 at 9:40am
Great work Chronic Dev-Team. :) Does anyone know how to Remove Animated Boot Logo From Greenpois0n? Thanks.
john b - February 6, 2011 at 7:21am
i just got the rick astley ikee wallpaper virus from years ago about a day after applying this jailbreak :(
john b - February 6, 2011 at 9:05am
i meant after a day i did the jailbreak (did this yesterday) i suddenly got the rick astley wallpaper virus this evening. so don\'t forget to change your root and mobile passwords. found some instructions on how to remove it with google\'s help.
Tony L - February 5, 2011 at 4:27am
Download the new greenpois0n rc5.2 follow the same steps, it\'ll still give you the \"unable to find\" lines and when that happens press and hold the sleep button (as you\'re already holding the home button still) and new command lines start to run and the JB WILL WORK
Thanks - February 5, 2011 at 4:45pm
Thanks for the heads up on holding down the sleep button if the JB hangs up. It did the trick for me. But as for GP_2 i don\'t think it\'s any different.
Thanks - February 5, 2011 at 7:29pm
Forgot to add I still needed redsnow to add cydia after the jb
WLWO - February 6, 2011 at 10:13am
Awesome link! Helped me in my jb for my iPod 4! Thanks for the tips too! Now I can rest :D
Hank4653 - February 4, 2011 at 2:23pm
So after trying this 20 times looking at dozens of different guides I finally found out what the problem was ( unable to... gp init) there is a update for greenposion rc5 as soon as i tried rc5-2 it worked first time. So if you are getting those same errors and downloaded the app GP last night grab a new copy. Found the info at*
rob54321 - February 5, 2011 at 8:56am
the greenpoison website is offline and i cant find the rc5-2 download! Any ideas of where else i could get it?
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