Jailbreak iOS 4.2.1 [All Guides] - iPhoneHeat

Jailbreak iOS 4.2.1 [All Guides]

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.

Jailbreak iOS 4.2.1 Firmware

Follow the Guides linked under your concerned device to jailbreak iOS 4.2.1 firmware.

Jailbreak iPhone 4

Jailbreak iPhone 3GS

Jailbreak iPhone 3G

Jailbreak iPod Touch 4G

Jailbreak iPod Touch 3G

Jailbreak iPod Touch 2G

Jailbreak iPad

Jailbreak Apple TV 2G

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23 comments… add one
LserH February 7, 2011, 11:32 am

Still waiting for new baseband unlock!

Levi February 15, 2011, 8:45 am

same here, Still waiting for new baseband unlock! for 16.15.00 iPhone3G

gaminy February 7, 2011, 3:05 pm

So, witch one is better for Iphone4, GreenPoison or Redsnow? And wheres the unlock for 03.10.01 =[ ?

atto February 8, 2011, 7:37 am

thanks guys 🙂
After i jailbreake my 3gs iphone 4.2.1 with greenpiosen, i’m having a problem with photo application. when i open this app, it says please wait updating photo library then it crashes to the springboard. any ideas how to fix that

rtavar February 8, 2011, 8:35 pm

Anyone knows how to downgrade iphone3g on ios 421, basebando 06.15.00 to ios 321?


Thaddeus February 10, 2011, 10:12 am

its been a month since the announced the unlock release..
its been a week since the untethered jailbreak for iP4 4.2.1 . . . and there’s no news for unlock.. this is getting hopeless..

Queenofhearts February 10, 2011, 11:39 pm

Does this work for 4.2.6 on iphone 4? Is there a jailbreak for 4.2.6? Is jailbreaking the verizon iphone the same process as normal jailbreaking?

diddat February 13, 2011, 9:12 pm

i have a problem with my 3gs keep shutting down on it own after 4.2.1 jailbreak. anyone know a good solution?

diddat February 13, 2011, 9:14 pm

i have a problem with my 3gs keep shutting down on it own after 4.2.1 jailbreak after 4.2.1 jailbreak. anyone got a good solution for this problem?

aderito February 23, 2011, 6:18 pm

i love

kyoko March 19, 2011, 2:37 pm

I have an iphone 4 on ios4.0.1 ,hasn’t jailbroken.
Can I use the newest version of Greenpoi0n to jailbreak it? or I need to update it to ios4.2.1 first?
Now the ios4.3 is out, can I still use tinyumbrella to preserve my baseband and update to 4.2.1?
by the way, I am a windows user.
Please help me. Thanks a lot in advance.

MNW December 15, 2011, 4:08 am

I’ve always had a problems of any sort ever since I wanted to have the ios5 look on my 4.2.1
iPhone 3g
I upgraded to Baseband 6.15.00 (Upgrading probably is probably playing a role in my ongoing struggles.) (unlocked with UltraSn0w)

The first time I jailbreaked, and eventually unlocked, I used redsn0w.

I discovered Whited00r.

I downloaded it; did not use a traditional jailbreak program. Whited00r instructed to just do a shift+restore…Once I did this, my iPhone started to restore, but stopped 3/4’s of the way through, putting my iPhone into recovery mode. Since then I was unable to restore to factory iOS 4.2.1. For a while I was pretty stumped. I soon discovered REB 2 to put it into DFU mode, I had to use sn0wbreeze to jailbreak my iPhone. I still cannon restore to factory settings, and cannot solely use redsn0w. (I use sn0wbreeze to jailbreak, but it doesn’t allow me to use a home screen background, so I use redsn0w afterwards.) I’d like to know how to completely restore my iPhone back to factory settings, and use redsn0w like I used to. (Maybe figure out how to use whited00r with my baseband and iOS, to get the iOS 5 look, if it doesn’t ruin my iPhone again).

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