Hard Reset SAMSUNG S7270 Galaxy Ace 3

1. Remove from you phone battery, SIM card, and memory card.
2. After about 10 seconds put the battery back into phone.
3. Then press and hold Volume Up + Home button + Power button.
   
4. If logo Samsung appears, then release only Power buton.
   
5. When you see Android green man release rest of buttons.
6. Now you will see recovery menu, where you select "Wipe Data / Factory Reset" usingVolume down button, and confirm with Power button.
   
7. Use again Volume down key to select "yes" and confirm with Power key.
   
8. After finish this operation select "Reboot System Now" option, and confirm it using Power key.
   
9. Now the phone will reboots, wait for it to be fully on and then you can start using it.

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