FREE Download Samsung Firmwares from HERE:http://updato.com/firmware-archive-select-model
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In this video tutorial I will show you how to upgrade or downgrade firmware, free and easy, with Odin on Samsung Galaxy J3 (2016) J320F (Android 5.1.1).You can use this operation if you have various problems with the phone software.
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You do this at your own risk! Make sure your phone battery is fully charged!
Better remove the SIM card and memory SD card from your phone before this operation!
If you reset or update your phone, all your data may be lost, so it’s good to do a full backup before!