To factory reset your Samsung J9, follow these steps:
1. Back up your data: Before doing a factory reset, make sure you back up all your important data such as contacts, photos, videos, and messages to avoid losing them.
2. Turn off your Samsung J9: Press and hold the power button until the power options appear.
3. Enter Recovery mode: Press and hold the Volume Up and Power buttons together until the Samsung logo appears, then release the Power button but keep holding the Volume Up button until you see the Android logo.
4. Navigate to Wipe data/factory reset: Use the Volume buttons to navigate through the options and the Power button to select.
5. Confirm the action: Select Yes – delete all user data option to confirm and start the factory reset process.
6. Wait for the process to complete: The process may take a few minutes. Once it's done, select Reboot system now to restart your Samsung J9.
7. Set up your device: Once your Samsung J9 restarts, set it up as a new device.
Note: Factory resetting your device will erase all data, including apps and settings. Make sure you have backed up everything that you need to keep before proceeding with the factory reset.