Steps to Reset SQL Server Password

Click on Browse option provided to "Select (master.mdf) file" and load the desired MDF file.

Locate and select the MDF file. Click on Open to load the file.

Afterward, 'Scanning completed Successfully' screen will appear on the software interface. To proceed further, click on OK button.

The tool will list all the users that were created in SQL Server. The Password column carries two values as

Unknown :- It means you have a password applied on an encrypted database.
Empty :- It means you do not have a password for the user name and you can log into the account without a password.

Select the user whose password you want to reset and click on Reset Password.

Caution: Before proceeding further it is highly recommended to take a backup of your Master.mdf and Master_log.ldf files as the tool will make changes to the Master database in the next step.

The tool will prompt you to take back up the Master.mdf and master.ldf files before continuing. Click on OK

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 reset successfully.

Now log in to SQL Server with new password.