1. Disconnect the charger and remove the battery.
2. Wait for at leats ten seconds and insert the battery to start the device.
3. When you see the NOKIA Welcome screen, immediately press and hold down the [= (Left Key) +Menu [.-
The Key [.- should be press at last.
4. Confirm that you want to format. Formatting start.
Pleaz i dindn't localized those keys,
sorry to be so stupid
i'm using nokia 7710 and my touch screen doesnt function since 2 day, so help me to format all.