It depends what phone it is
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Applications get erased when you do a factory reset.
germany
No, even if you factory reset the Galaxy S4 it will not downgrade.
If you do a factory reset then yes you will loose everything.
you cant
To reset your Galaxy S3, you simply need to: Launch settings, Open "Backup and reset," and tap "Factory data reset" to reset your galaxy s3 to its original factory settings.
Resetting a rooted phone back to factory setting can be easy. All you have to do is go to the settings and click on the factory reset.
Chrysler does not have reset buttons. The factory alarm is reset by unlocking the doors with a key or remote.