my iphone model no-A1241 serial no-879******7H is not restoring after update with itune error msg shows 1510

If you're phone has not been officially unlocked by the carrier, restoring the firmware will lock it again:

Error 1015: This error is typically caused by attempts to downgrade the iPhone, iPad, or iPod touch's software. This can occur when you attempt to restore using an older .ipsw file. Downgrading to a previous version is not supported. To resolve this issue, attempt to restore with the latest iPhone, iPad, or iPod touch software available from Apple. This error can also occur when an unauthorized modification of the iOS has occurred and you are now trying to restore to an authorized, default state.

copied from iTunes: Specific update-and-restore error messages and advanced troubleshooting

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