IPhone 3G won't update to 2.1; claims unknown error (-19)

Hi guys. Trying to update my vanilla 3G (which was only restored two days ago) to the 2.1 update today and it simply won't update. It manages to download correctly but just after 'extracting' it fails. I've restarted the phone, i've restarted iTunes, swapped USB ports and all i get is this: http://img135.imageshack.us/img135/8817/picture146yk2.png
Any ideas? At the moment i'm doing a massive, long backup with the hope that I will be able to do a restore & update and restore from the backup but I doubt this will work as every backup i've made in the last few months is reportedly 'corrupt'. Would it be worth phoning Apple support?
Thanks,
Phelim
Message was edited by: Phelim

My friend encountered the same problem with the 2.0 or 2.02 updates. We narrowed it down to the internet connection (believe it or not).
Their macs and dell were networked via a Hawking wireless router setup. Somehow, the iPhone update file would get corrupt and not allow the iphone to update.
When either the mac OR the dell was plugged into the cable modem directly (not the third party Hawking device), the updates went smoothly on both iphones.
And this happened on separate occasions.
I'm not sure if this was due to error or "noise" on the cable connection that somehow were not being corrected or perhaps were being mangled by the wifi device.... but it sure fixed the problem 100%.
Try connecting your computer directly to your broadband modem. See if that allows you to update.
good luck!

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