Update iOS 4.3.3 failed on iPad

Question

I was updating the OS on my iPad to 4.3.3 from 4.3 and it failed with Unknown Error. Upon trying to restore from recovery mode to Factory settings, it failed too and now ITunes displays a message saying "There is a problem with your device" and says the device you connected may be damaged and cannot be activated for service.
What can I do to restore from a backup ?

Answer 1

I said this in another forum, this seems to work for me, I now have a fully functional iPad 1G on 4.3.3, I just restored like 10-20 minutes ago:
Ok, here is the solution:
I just booted my iPad into DFU Mode, then restored. Here are instructions:
1.) Plug your iPad into your computer.
2.) Hold the top power button (lock button) until the 'slide to turn off' comes up. Slide to turn the device off.
3.) Once the device is completely off (and still plugged into the computer) hold both the lock and home buttons in for 10 seconds.
4.) After 10 seconds, release the lock button, but continue holding the home button. Nothing should be on the iPad 1G's screen.
5.) iTunes should say something about how it found a device in recovery mode. Click on the 'restore' button.
6.) Wait for the software to download (if you have not downloaded it already) and wait for the iPad software restore to finish.
7.) Either restore your iPad from backup or set it up as a new iPad. I set it up as a new iPad, and it works now.
If this doesn't work for you, try restoring from a different computer, and try deleting and redownloading the firmware file.
I used an iPad 1G (wifi only) 16GB, and restored from a 13" MacBook Pro with the latest iTunes (10.2.2?).