iPhone Dev Team has released the redsn0w 0.9.6 b4 / beta 4 for Windows and Mac OS X to jailbreak iOS 4.2.1 on all the devices. But for some devices ( mentioned below ), the redsn0w 0.9.6 b4 / beta 4 supports only tethered jailbreak. You could get redsn0w 0.9.6 b4 for iOS 4.2.1 jailbreak from the below links.
In the following devices, redsn0w 0.9.6 b4 supports tethered jailbreak :
- iPhone 3GS New Bootrom
- iPhone 4
- iPod Touch 2G (MC Model)
- iPod Touch 3G
- iPod Touch 4G
- iPad
For the following devices, redsn0w 0.9.6 beta 4 support untethered jailbreak :
- iPhone 3G
- iPhone 3GS (Old Bootrom)
- iPod Touch 2G (Non MC Model)
Download Redsn0w 0.9.6 b4 for Windows from here
Download Redsn0w 0.9.6 b4 for Mac OS X from here
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