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Unknown sources: Check this option to permit installation
of apps from sources other than the Play Store.
Trusted credentials: Display trusted CA certificates.
Install from SD card: Install certificates from the memory
card.
Clear credentials: Delete all certificates.
Backup and Reset
Back up my data: Back up app data, Wi-Fi passwords, and
other settings to Google servers after you sign in to your
Google account.
Backup account: Set the Google account needed for
retrieving backed up data.
Automatic restore: Restore previously backed up settings
and data when you reinstall an app.
Factory data reset: Reset your phone to factory default
settings. All your personal data from the phone’s internal
storage will be erased. You can also erase the data on the
memory card during the process.
Accounts
Manage your accounts and synchronization. Touch Add
account to sign in to or create accounts on your phone.
Touch an account type to see that type of accounts you have
added and adjust the accounts settings.