How to Fix Not Working Android Phone | Format or Hard Reset

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Press and Hold Voume up key which at the left + Home button at the bottom and Power key at the right… hold them until you Samsung logo…
once the logo appears only release power button.
once you will get system recovery mode release all the button…
then use volume down key and select wipe data/factory reset and press power key to confirm after that it will confirm then use volume down key button and select yes – delete all user data and then press power button to confirm and then wait until it completes and then select reboot system now and press power key.

Source: Youtube