Factory Data Reset - Samsung Galaxy E5 User Manual

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Back up my data: Enable back up of application data,
Wi-Fi passwords, and other settings to Google servers.
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Automatic restore: Enable automatic restoration
of settings from Google servers. When enabled,
backed-up settings are restored when you reinstall an
application.

Factory Data Reset

Return your device to its factory defaults.
Warning: 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.
1. From a Home screen, tap
2. Tap Backup and reset > Factory data reset.
3. Tap RESET PHONE and follow the prompts to perform the
reset.
Settings
Apps > Settings.
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Backup and Reset