Hard Reset SAMSUNG Galaxy A8

First method:

1. At the beginning switch off your mobile phone by holding down the Power rocker for a short while.
2. Afterwards press and hold together: Volume Up + Home + Power button for a couple of seconds.
3. As soon as the Samsung Logo appears release held keys.
4. In the next step select from menu "wipe data / factory reset" using Volume buttons to navigate and Home button to confirm.
5. Choose "Yes -- delete all user data" to confirm the whole operation.
6. After that select option "reboot system now".
7. Well done! The hard reset has just been performed.

Second method:

1. Start by turninng on the device by holding down the Power key.
2. From the Home Screen go to Menu and then to Settings.
3. Tap Backup & Reset and then Factory data reset.
4. Afterwards choose Reset device.
5. To confirm your choice select Erase everything.
6. That's all. You have just performed the hard reset operation.

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