my iphone 3gs is stuck in recovery mode and wont restore keeps coming up unknown error 1015

sir
my fhone seen itunes icon and usb hub and i connect computer restore not restored error1015 plz guide me

1015 error: There are 4 possible causes of this error:

The activation server truly is unavailable. Rare, usually fixed within minutes.

Your antivirus or firewall or router's firewall is blocking access to

gs.apple.com on ports 80 and 443.

Your iPhone is jailbroken or otherwise hacked.

The computer you connected to during the restore/update was

used to hack/jailbreak some other iOS device, and its

network database was corrupted during the process.