Hard Reset SAMSUNG I9105 Galaxy S II Plus

1. Turn on the device.
   
2. Press and hold Volume Up key + Home key then press Power key.
3. Keep pressing the above keys until Samsung logo appears,Then release all keys.
4. After some seconds you will be into Factory Reset menu.
5. Use Volume Down key to scroll down and select Wipe Data / Factory Reset option.
   
6. Use Power key to confirm the operation.
7. You need to use the Volume Down key again to select "Yes -- delete all user data".
   
8. Use Power key to confirm the operation one more time.
9. After performing the hard reset, Select Reboot System Now option, and confirm it usingPower key.
   
10. Now the phone will reboots.

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