TO RESET SETTING WHICH IS CALLED SOFT RESET FOR NOKIA C5-03, PRESS *#7780# ON YOUR MOBILE. IMMEDIATELY THE SOFT FORMAT WILL BEGIN.
TO HARD RESET YOUR NOKIA C5-03, PRESS AND HOLD ANSWER+REJECT+CAMERA AND PUSH POWER BUTTON UNTIL NOKIA LOGE APPEAR ON THE DISPLAY.
IMPORTANT: HARD FORMAT WILL DELETED YOUR ALL DATA FROM PHONE MEMORY AND MEMORY CARD. PLEASE BACK UP YOUR USEFUL DATA BEFORE HARD FORMAT. BEFORE HARD FORMAT PLEASE CHARGE YOUR MOBILE BATTERY FULLY. IF YOUR MOBILE BATTERY BECAME EMPTY DURING HARD FORMAT. YOUR PHONE MAY NOT OPEN PROPERLY OR PERMANENTLY.