This is an update to my previous iPad Jailbreak tutorial, in this post we will be upgrading our iPad to the latest firmware version 4.2.1 and then will jailbreak using the latest Redsn0w jailbreaking tool. First things first, update your iTunes to the latest version which is 10.1.1 as of now and after that follow the step by step instructions with screenshots to jailbreak your iPad.
How to Jailbreak iPad on Windows



If this is not your first time you should be comfortable entering your iPad into DFU mode. To enter DFU Mode just press “Power button” for 2 seconds don’t release it, now press “Home button” for 10 seconds simultaneously with “Power button”, now release the “Power button” and keep pressing “Home button” for 10 seconds.


Congratulations your have successfully jailbreaked your iPad.
Note: As of now, the jailbreak for iPad firmware 4.2.1 is tethered, which means if you shutdown/restart your iPad then you have follow the last step again.
Tested the above jailbreak method on iPad 16 GB on Windows 7.
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