Samsung Focus S i937 hard reset using key comboPress the Camera key + Volume down key and Power key together.
The Focus S i937 device will vibrate, now release only the Power key, but continue pressing the Camera and Volume down keys. Once the device displays the "Are you sure you want to format?" screen, release the Camera and Volume down keys.
Format device by pressing Win logo key and press again to confirm.
Note: Formatting erases all user data stored on the device and on the microSD card!
Use this method to hard reset your Samsung Focus S i937 phone: Enter *2767*3855#. Warning! All your data including contacts, messages etc. will be lost! Copy all your necessary data/Contacts/Messages etc. to SIM or make backup to your PC before full reset! Take out SIM card before full reset.