My iPhone 3G won't open after attempting to update OS :(?

IceG

New member
- It's jail-broken
- Previously on 4.1 (I wanted to update to 4.2)
- I backed up my iPhone before updating, but it won't restore my back up
- I always get error 1015 on iTunes when I try to restore
- There is an iTunes logo and a USB cord displayed on my screen
- My iTunes is updated (10.5.2)

What do I have to do? I need my phone back :(
 
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