How to format Nokia phone (Hard Reset)!

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If u face problems mentioned below on your phone
1.Unable to boot (switch on) the phone,blank screen. 
2.Only able to boot up-to 'NOKIA' word screen. 
3.Unable to uninstall(remove) program after installation. 
4.Error message such as 'Child Installer' appear continuously.
or, having some other problem and u thinking to format the phone
Then u may need to format your phone. 
As: 

• Be sure 3/4 charge level of battery left. 
• Backup your contacts and important files on memory card.All installed programm will be lost. 
• press & hold these 3 keys-GREEN DIAL KEY + *(star key) + 3(NUMBER KEY). 
• Remember,hold till you see a formating word shows. 
• After formating your phone will back to 'factory setting' state.

For Nokia N97, keys are "SHIFT+Space Bar+Backspace" and hold power key until phone restarts and "handshaking" screen appears.

For Nokia touch phone:

• Turn off the phone
• Press "Green+Red+Camera" together
• Press and hold until handshaking screen appears.

This trick may solve your problem.


Also you may try these codes:

*#7780# - Restore factory setting

*#7370# - Reformat