iphone 3G update error 1015

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.

(Thanks to Lawrence Finch for the wording in

https://discussions,apple.com/thread/4793244?start=90 )

how to resolve this problem?

If the server is truly down, try again.

Turn off your firewall and anti-virus until the update/restore is completed.

If your computer has been used to jailbreak an iOS device or your

iPhone is jailbroken, you cannot get help here per Terms of Use for

this forum. Your favorite search engine may provide some direction,

but it is also possible that the jailbreak has rendered your iPhone

un-restoreable and un-useable.