Apple iOS4.2.1 can be jailbroken using Redsn0w.
I am here providing you redsn0w 0.9.6 b4 to jailbreak iOS 4.2.1 on Windows and Mac OS X .
Redsn0w 0.9.6 b4 supports tethered jailbreak for below items:
* iPad
* iPod Touch 2G (MC Model)
* iPod Touch 3G
* iPod Touch 4G
* iPhone 3GS New Bootrom
* iPhone4
Redsn0w 0.9.6 b4 supports untethered jailbreak for below items:
* iPod Touch 2G (Non-MC Model)
* iPhone 3G
* iPhone 3GS (Old Bootrom)

Download redsn0w 0.9.6 for windows
Download redsn0w 0.9.6 for Mac OS X
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Hi Atul,
Thanks for the linkback.
how are you doing? visited your blog after longtime.
@Nihar: Welcome and Thanks 2 times
One for linkback and other for visiting my blog.
I am fine. What about you?
Actually I have started blogging after a long time.
I’ll focus on my blog now.
Hope to earn something good