Sir,where then i will get the solution for error 1015, kindly help me in solving the problem

This is what Apple says about error 1015.

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.

Google "Error 1015" and there is a solution.

You will not get help here with that problem. That error means that you phone was hacked/jailbroken. You cannot get help here for jailbroken or hacked phones.

You will have to find help eslewhere. Sorry.