HT1222 restoring iphone 3GS - error message 'unknown error -1' occurred.

when restoring my iphone 3gs itunes attempts to restore then come back with error message 'unknown error -1' occurred. what to do now?

Hey Lawrence,
A big THANK YOU!! to you! Your suggestions worked!
Before I changed USB ports (more on that in a sec...), I employed one of your suggestions that you gave to someone else with the same problem...and that was to clean the connector on the bottom of the phone with a soft dry tooth brush. I couldn't believe the amount of lint that came out! Especially what was found in either end...had to do some very careful picking. (Almost enough lint to knit a small sweater!!)
Changing the USB port was the second and final step required for a successful backup. My computer is a laptop, and I did have a USB Bluetooth adapter (for another device) installed. I removed  the adapter, plugged the iPhone into that USB port, crossed my fingers...and it worked!!!
Now if I can figure out the rest of this darn program, I might upgrade to a new iPhone!
Again, thank you very much Lawrence!
Rich

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