Problem upgrading to iOS5

I have been having problem upgrading my iPad 2 to OS5 from my current 4.3.3 version. Dowloaded it 2 times completedly but towards the end it came out the message that my connection stopped (which is not). Then I tried restoring it to "original factory setting" first coz I thought maybe I am having this problem due to my Jailbreaking......but it turned out the same.....all 700 over MB was successfully downloaded but could not go the the next step....Error Message: Connection stopped working. Has anybody encountered this before? I have wasted countless hours try to do this upgrading but failed.

Have a look here...

iOS 5 Upgrade Troubleshooting