Warning: Flashing can brick your device if done incorrectly. Ensure your battery is fully charged. Open Phoenix Service Software. File -> Open Product and enter your phone's RM type (e.g., RM-645). Flashing -> Firmware Update
Some developers have created custom ROMs for the Nokia C5, which offer additional features, improved performance, and a more personalized user experience. These custom ROMs are not officially supported by Nokia, and users should be cautious when installing them, as they may void their warranty and potentially cause issues with their phone.