Need a little bit more information, please, as in, what are you trying to do with your iPad? Unjailbreak it? Upgrade it? Restore and put iOS 4.2.1 back on?
For most of the questions, if the answer is yes, give a try on following the steps outlined in this tutorial: http://www.ipadforums.net/jailbreak...-your-ipad-using-tinyumbrella-shsh-blobs.html
It has helped a lot of people get their iPads in good working order. Let us know how you get on or if that doesn't help/work...
Marilyn