Watch the working preview of software and simply follow the steps :
Install & run the SQL MDF Password Recovery Software.
Click on Browse to load master.mdf file.
Select the Master.mdf file and Click Open
'Scanning completed Successfully' screen will appear. Click Ok to proceed.
The tool will list all the users that were created in SQL Server. Password column carries two values as
Unknown and Not Set
Select the user whose password you want to reset and click on Reset Password
The tool will alert you to take back up the Master.mdf and master.ldf files before continuing. Make sure you have backup of mdf file before loading it to the software.
Click Ok to proceed.
Once you click on Reset Password the 'Password Settings' screen will appear on your screen which allow you to set new password. Type new password, confirm it and Click Ok
Your Password has been resetted successfully. Click Ok
Now log in to SQL Server with new password.