If you cannot flash the phone, you can try a factory restore using the default security code 12345 .
Since the device was discontinued in 2013 , official Nokia support servers (like Navifirm) are no longer active. Users often rely on community archives and firmware repositories to find the correct files for their specific region. Always ensure you are downloading the correct (usually found under the battery) to avoid permanently damaging the device hardware. nokia c201 flash file
Once the process is complete, disconnect your device and turn it on. The first boot might take longer than usual. If you cannot flash the phone, you can