Got an error message while trying to upgrade to ISO4! Help!!!

I have upgraded my 3G phone with ISO4 software upgrade as requested by the system. The phone activation failed as Apple could not activate at that stage. Now my phone will not cut on, it stays on the Apple screen. I tried to restore the Iphone and it gave me another error message (unknown error 21). Help

I too have the same problem, was upgrading to ISO4 great until it was reinstalling the back up, has completely stopped working, just keeps trying to reboot itself, it appears in itunes but you can not do anything with it not even restore to factory settings! Was upgrading on a new computer as was having difficulties with a laptop and 7 yr old xp desk top, do I dump the iphone or take it to an Apple shop (not that they care!) tried restoring on 3 computers same message!

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