You can install dfndr security by following these steps:
1- Open the Google Play Store app on your phone.
2- Tap on the search bar at the top of the store and type “dfndr”. Then select dfndr security – Privacy & Boost.
3- Select “Install“.
4- After reading the required permissions, touch “Accept“.
5- Wait for the download to complete.
dfndr security has been installed! Now you can use it to protect your device.