Download and unzip ResetPassword script and place the file named ResetPassword.bat and ResetPassword.sh under OpManager_Home/bin directory.
Stop the OpManager service
Open Command prompt as Administrator ( Right Click on CMD -> Run As Administrator ) execute the ResetPassword.bat/.sh script ( ResetPassword.bat for Windows and ResetPassword.sh for Linux )
The script will prompt for confirmation for change password [Are you sure to reset the password for admin user ?]
type y to change password and success message will be shown [Password has been reset as 'admin']
Important : Remove scripts and the best practice is to use 'Forgot Password' option available in login page
configure Mail Server Settings and email address in admin user profile to use Forgot Password option
NOTE : If the script executed when OpManager is running, it will throw error to stop OpManager.