My iphone 4 got stuck in DFU mode - Please help

I am a newly registered developer. Tried updating 5.0 beta officially. After done then only i have noticed that i have not registered the device. So phone is not got activated.
1. I have restored to factory setting using DFU mode.
2. Once restored i have restistered the device in apple website with the 40 digit device number
3. Now if i try to upgrade it to 5.0 - geeting an error message and unable to upgrade
4. Stuck in DFU mode and itunes prompts to restore the iphone as it says "it has found the iphone in recovery mode"
Now i have the IOS 5.0 ipsw file and unable to update my phone - Please help.

update not success...shows the device is not compatible with the Software to be updated...error: 3198

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    Thanks for the reply, yes I did disable my firewall and antivirus software staight after my first failed restore attempt but it made no difference, like you I also checked out the error code explination.
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    http://support.apple.com/kb/TS3281
    In particular -
    5. If the above steps do not resolve the issue, or the if the screen remains black or shows a persistent Apple logo, try restoring with iTunes:
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    Thanks for using Apple Support Communities.
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    Brett L

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