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
- How to: jailbreak iPhone 4 iOS 4.2.1 with Greenpois0n (Untethered)
- How to: jailbreak iPhone 4 iOS 4.2.1 with RedSn0w 0.9.7 (Untethered)
- How to: jailbreak iPhone 4 iOS 4.2.1 with RedSn0w 0.9.6b4 (Tethered)
Jailbreak iPhone 3GS
- How to: jailbreak iPhone 3GS iOS 4.2.1 with Greenpois0n (Untethered)
- How to: jailbreak iPhone 3GS iOS 4.2.1 with RedSn0w 0.9.6b4
Jailbreak iPhone 3G
- How to: Jailbreak iPhone 3G iOS 4.2.1 with RedSn0w 0.9.6b4 (Untethered)
Jailbreak iPod Touch 4G
- How to: Jailbreak iPod Touch 4G iOS 4.2.1 with Greenpois0n (Untethered)
- How to: jailbreak iPod Touch 4G iOS 4.2.1 with RedSn0w 0.9.7 (Untethered)
- How to: jailbreak iPod Touch 4G iOS 4.2.1 with RedSn0w 0.9.6b4 (Tethered)
Jailbreak iPod Touch 3G
- How to: Jailbreak iPod Touch 3G iOS 4.2.1 with Greenpois0n (Untethered)
- How to: jailbreak iPod Touch 3G iOS 4.2.1 with RedSn0w0.9.6b4
Jailbreak iPod Touch 2G
- How to: Jailbreak iPod Touch 2G iOS 4.2.1 with Greenpois0n (Untethered)
- How to: Jailbreak iPod Touch 2G iOS 4.2.1 with RedSn0w 0.9.6b4
Jailbreak iPad
- How to: Jailbreak iPad iOS 4.2.1 with Greenpois0n (Untethered)
- How to: Jailbreak iPad iOS 4.2.1 with RedSn0w 0.9.7 (Untethered)
- How to: Jailbreak iPad iOS 4.2.1 with RedSn0w 0.9.6b4 (Tethered)
Jailbreak Apple TV 2G
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Also checkout:
- How to: Downgrade iOS 4.3 to iOS 4.2.1
- How to: Save SHSH blobs
- AppSync 4.2 – Install cracked apps on iOS 4.2.1
- How to: Install Cracked Apps on iPad *No WiFi*
Still waiting for new baseband unlock!
same here, Still waiting for new baseband unlock! for 16.15.00 iPhone3G
So, witch one is better for Iphone4, GreenPoison or Redsnow? And wheres the unlock for 03.10.01 =[ ?
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
Anyone knows how to downgrade iphone3g on ios 421, basebando 06.15.00 to ios 321?
Thanks
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..
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?
i have a problem with my 3gs keep shutting down on it own after 4.2.1 jailbreak. anyone know a good solution?
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?
i love
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.
I’ve always had a problems of any sort ever since I wanted to have the ios5 look on my 4.2.1
Details:
iPhone 3g
4.2.1
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).