Nokia 6088 hard resetRestore settings
You can reset some of the menu settings to their original values.
Data that you have entered or downloaded is not deleted (for example, entries in your contacts list are not affected).
1. In the standby mode, select Menu > Settings > Restore factory sett..
2. Enter the security code, and select OK.
You can format your Nokia 6088 device by typing: * + 3 + call + Power on. Before the device is reset, you need to provide the lock code. The default lock code is 12345.
If it is not working try this code:
You can format your device by typing *#7370# in standby mode. Before the device is reset, you need to provide the lock code. The default lock code is 12345.
Some Nokia phone can be reset via this menu option
Press menu button or enter Menu > Settings > Phone > Phone management > Factory settings > Delete data and restore > YES
Formatting the device will permanently erase all user data and settings as well as add-on applications and operator specific settings.