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*