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Nokia Full Phone Formatting! 1. Blank screen phone unable to reboot. 2. Phone only able to boot-up to 'Nokia' word screen. 3. Install some program but not able to uninstall it after that. 4. Error messages such as 'Child Installer' keeps popping-up. Do a full phone formatting on your phone as steps below; 1. Make sure you have at least 3/4 charge of battery power left. 2. Backup your contacts list and personal files to MMC memory card. (see link below) 3. Switch-off your phone. 4. Press and hold these 3 keys; Green dial key, * (star key) and no. 3 key and then press the power on/off to switch on the phone. Remember, do not let go all of the keys, hold until you see a formatting word screen show! 5. After a few minutes when the full phone formatting completed, your phone will be back to original system and factory setttings. All applications installed will be lost unless you've made a backup on your mmc. You can restore the backup to the C drive again.