Hello there, Raghava Rastogi.
There are some initial troubleshooting steps outlined in the following Knowledge Base article:
Additionally, if you click on the #9 for the error message number you are referring to, there are some additional steps to try:
This error occurs when the device unexpectedly loses its USB connection with iTunes. This can occur if the device is manually disconnected during the restore process. This issue can be resolved by performing USB troubleshooting, using a different USB dock-connector cable, trying another USB port, restoring on another computer, or by eliminating conflicts from third-party security software.
Thanks for reaching out to Apple Support Communities.