Samsung GT-i9100 Galaxy S2 Hard Reset

                                    PRESS AND HOLD VOLUME UP BUTTON + HOME BUTTON
                                        Keep pressing these 2 buttons + Power button for 2-3 Seconds
                            Release only Power button but KEEP pressing Volume up button + Home Button
                             with volume down select wipe data/factory reset Press POWER button to confirm
                                  then select Yes--delete all user data and press POWER button to confirm
                     now u need to reboot the device select reboot system now and press POWER button to reboot