How do I reset my Samsung smartphone?
Before you start: create a backup
When resetting your Samsung smartphone, all your personal files are deleted. That means all your photos, videos, and contacts are erased as well. That's why you should first create a backup of all the files you want to save. You could store them on a memory card or in the cloud, for example.
Step 1: open the menu with all your apps
Open the menu with all the apps via your homescreen.
Step 2: settings
Step 3: general management
Scroll down and press General management.
Step 4: resetting
Step 5: restoring factory data
Press Factory data reset.