Iphone 4.2.1 jailbreak windows, and Mac

IPhone Dev Team has released the redsn0w 0.9.6 b4 / beta 4 for Windows and Mac OS X users now jailbreak IOS 4.2.1 on all the devices. But there is  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

• redsn0w_for windows_0.9.6b4.zip
• redsn0w_win_0.9.6b4.zip
• redsn0w_win_0.9.6b4.zip
• redsn0w_win_0.9.6b4.zip

Download Redsn0w 0.9.6 b4 for Mac OS X from

• redsn0w_mac_0.9.6b4.zip
• redsn0w_mac_0.9.6b4.zip
• redsn0w_for mac_0.9.6b4.zip