Samsung Galaxy S2 - Kies cannot connect S2

After spending hours of searching solution to fix this annoying issue, I come to this solution work for me.
I seldom download driver files from unknown source and this method looks good for me.

1) Unplug USB cable
2) Dial *#7284#
3) A PhoneUtil will launch and you will "UART" and "USB"
4) Although the "USB" shown "PDA" is selected, Please select "MODEM" and then select "PDA" mode again.
5) Plug the USB cable without exit PhoneUtil.
6) Samsung Kies software will launch and the device drivers will be installed.

7) After a while, the proper drivers will be installed and you will need to restart you computer.

8) Please note that I have upgrade the Kies to latest version and also the S2 to firmware 2.3.6.

Other useful notes for hard reset the S2 (all data will be wipe off)

Performing a factory data reset via settings

1. Go to Settings.
2. Select Privacy.
3. Click on Factory data reset.
4. Check Format USB storage if needed only.
5. Click on Reset phone.
6. Finally, select Erase everything.

Performing a factory data reset using phone buttons

1. Turn off SGS2.
2. Press and hold down Volume Up + Home + Power buttons at the same time.
3. Release all buttons when you see SGS2 Logo.
4. Android system recovery will be loaded then.
5. Select wipe data/factory reset. (Volume buttons to go up or down, select with Home button)
6. Select Yes — delete all user data.
7. Finally, select reboot system now.

Performing a factory data reset using dialpad

1. Warning ~ no turning back after key in.
2. Bring up dialpad.
3. Key in *2767*3855#
4. Finally, SGS2 will be rebooted and factory data reset.