Hard Reset SAMSUNG J210F Galaxy J2 (2016)

First method:

1) The device must be switched off, so hold down the Power key for a few seconds.

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2) Afterwards press and hold together: Volume Up + Home + Power button for a couple of seconds

3) You can release held keys when the Samsung Logo appears on the screen.

4) Then select from Recovery Mode menu "wipe data / factory reset" using Volume buttons to navigate and Power button to confirm.

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5) In the next step choose "Yes -- delete all user data" to confirm the whole operation.

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6) When the Recovery Mode appears again on the screen select option

"reboot system now".