Hard Reset SAMSUNG A310F Galaxy A3 (2016)

First method:

1. Frist of all, switch off the cell phone by pressing the Power button.
2. Afterwards press and hold together: Volume Up + Home + Power button, until you see Samsung logo.
3. Then select from Recovery Mode menu "wipe data / factory reset" using Volume buttons to navigate and Power button to confirm.
4. In the next step choose "Yes -- delete all user data" to confirm the whole operation.
5. After that select option "reboot system now".
6. Well done! The hard reset has just been performed.

Second method:

1. Start by turninng on the device.
2. From the Home Screen go to Menu and then to Settings.
3. Tap Backup & reset and then Factory data reset.
4. Read the note about process and tap Reset device.
5. To confirm your choice select Delete all.
6. That's all.

Hard Reset SAMSUNG A300F Galaxy A3 - Remove Pattern Lock by Recovery Mode

Hard Reset SAMSUNG A300F Galaxy A3 - Erase all data by Factory Reset

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WARNING !
Hard Reset will erase all of your data
All described operations you are doing at your own risk.