You can surrender the activated Tally.ERP 9 when :
Hard Disk has to be formatted
Reinstalling the Operating System
Reactivating the license on another computer or site.
To surrender, the user has to execute the following steps:
Go to Gateway of Tally or Company Info menu
Press F12:Configure
Select Licensing > Surrender
Tally.ERP 9 displays a message You are about to Surrender Your License. Continue?
Press Y or click Yes to proceed with surrendering the license.
The Login As Remote Tally.NET User screen is displayed.
Provide your E-Mail ID in Your E-Mail ID field.
Provide your Tally.NET Password in Your Tally.NET Password field
Press Enter
Tally.ERP 9 displays a message as shown: