IPad will not update to iOS 4.2.1 - Error 1645. Help please?

I have managed to download the 4.2.1 software but in the actual updating phase, my iPad reboots and it is after this reboot that an error message pops up "1645- unknown error". I have tried several times to update my iPad but the error message always comes up. I have also tried restoring, which gives the same error message and I have tried using a different computer- once again giving the error message. Thanks for your help in advance!

I got the error 1645 with my iPad2 trying to upgrade to iOS6. I did everything that was described on http://support.apple.com/kb/TS2529?viewlocale=en_US, but nothing helped. Every time I tried to recover I got error 1645 or -1. So I talked with Apple Support and they told me to extend my
attempts to http://support.apple.com/kb/TS2529?viewlocale=en_US - but that didn't helped. They were realy
amazed because error 1645 isn't documented in their KB. I then tried to downgrade (download the firmware from Apple and select the file after pressing "recover" with option key) - same error again.
They now told me to try it on a different network with a different mac - but that produced the same error again and again.
Apple support finaly told me to send the iPad to them, because that seems to be a hardware defect. We will see …
I'll keep you informed.

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~~~~~~~~~~~~~~~
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IPad will not update to iOS 4.2.1 - Error 1645. Help please?

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