In our description database there are 2 solutions for performing hard reset for Nokia 603.
Choose the first method and follow the steps to perform a hard reset. If the first solution does not work, try the next method.
Please remember! Hard reset will delete any and all data your device contains; like pictures, contacts, messages, apps etc. Everything. Nokia 603 device will be brought back to the same configuration as that of a brand new device.
1. Power up the phone.
2. Open the dialer, enter this code into it - *#7370# - and confirm.
3. Enter the lock code into the phone (12345 by default). Device will reset and restart.