Samsung GT-9505 Galaxy S4 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

Samsung GT-i8190 Galaxy s3 Mini 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

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