Unable to restore iPhone 4 (GSM) after IOS 5 update attampt

Hey,
I downloaded iTunes 10.5 and then tried to update iPhone 4 (gsm) to IOS 5.
the update had failed for no clear reason and from that point on I’m trying to restore it.
for the past 20 attempts (several on my laptop and the rest on a PC), I get the same error massage:
“The iPhone “iPhone” could not be restored. An unknown error occurred (-1).”
I have not jailbroken the iPhone, i only have dozen or so apps, synced it every other day.
b.t.w
i tried the DUF mode before connecting it to the pc.
also, i tried downgrading back and restoring with the following ipsw packages: IOS 4.3.2, 4.3.4, 4.3.5 and 5.
different error code appears with each ipsw.
in the last attampt it got through the whole progress bar (so it might now be a problem with the firmware), but then it err and gave me the same massage.
what shell I do now? plz help me.

I managed to upgrade to ios5 ok but now when im trying to restore from the backup to get all my apps, photos, contacts etc back i get the same -1 error message. Really hope someone can help please!!!

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Unable to restore iPhone 4 (GSM) after IOS 5 update attampt

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