How to factory reset your Samsung Galaxy smartphone

Factory Data Reset
You can reset your device to factory defaults, erasing all data from your device.
This action permanently erases ALL data from the device, including Google or other
account settings, system and application data and settings, downloaded
applications, as well as your music, photos, videos, and other files.
If you sign in to a Google Account on your device and set a Lock screen, Google Device
Protection is automatically enabled.
NOTE If you reset your Google Account password, it can take 24 hours for the
password reset to sync with all devices registered to the account.

Before resetting your device:

1. Verify that the information you want to keep has transferred to your storage
   area.
2. Log in to your Google Account and confirm your user name and .

To reset your device:

1. From Settings, tap General management > Reset > Factory data reset.
2. Tap Reset and follow the prompts to perform the reset.
3. When the device restarts, follow the prompts to set up your device