Learn how to use factory data reset on your Samsung Galaxy Note 4. Delete all settings and data on the device. Before performing a factory data reset, ensure you back up all important data stored on the device. Refer How to Backup and Restore data for more information.
- On the all Apps screen, tap Settings > Backup and reset > Factory data rest > Reset > Erase everything. The device automatically restarts.
Refer here to know more on Samsung Galaxy Note 4.