There are two different types of Reset for the Nokia 603 series, soft reset and hard reset.
Soft Reset Nokia 603
This option restores the .ini files from the ROM, does not erase data (photos, videos, documents) or applications from a third party.
To soft reset your Nokia 603 press the following combination *#7780# of keys on the keyboard .
Hard Reset Nokia 603
This option restores the original operating system from the ROM. Hard reset option will wipe all of your data and apps from the phone. Be sure you backup your files first.
To hard reset your Nokia 603 press the following combination of keys on the keyboard *#7370# or you can follow below instructions:
- Turn the device off.
- Press and hold Answer + Reject + Camera keys.
- Turn on the devide by pressing the ON button.
- Wait until the Nokia logo appear.
Important: To proceed to reset, the battery must be full and the mobile device connected to the charger. If during the course of reset, the mobile stop receiving electricity it can ruin the internal flash memory of the mobile device and stop function.