Nokia C6 Format Soft Reset - Hard Reset to Factory Settings

How to format or reset the Nokia C6 to factory fresh default settings.
This instructions below is a guide on how to reset the device. 
Note: This process may delete  the files you installed on Nokia C6. This may only advisable if the phone experiencing frozen or hang problems, burned out by excessive use or after installing 3rd party applications. You may need to back up all important data stored on the phone before you proceed,

Nokia C6 Soft Reset:
This will not harmed your data . Soft reset only restores .ini files from Flash ROM on board memory of your Nokia C6.

1.). Dial *#7780#

2). Press Ok/Yes

Nokia C6 Hard Reset
This will delete your data and installed applications. Hard reset will fully restore your Nokia C5-03 to default factory setting.

1). Turn the Nokia C6 OFF

2). Remove  the battery and reinsert it back again, then Turn it ON.

3). Dial this numbers *#7370#

4). Then Press Ok/Yes

Nokia C6 Hard Reset through button combination.

1). Turn the Nokia C6 OFF

2). Pull out the battery and reinsert it back again, then Power it ON

3). Simultaneously  press and hold *+3+Call Button (green/ok button)