Here is the another new firmware update for Nokia 5230. It gets update to v20.0.005. It has some cool changelog in the new firmware.
You can update the new firmware by OTA or Nokia Software Updater Application.
Improved Music Player,
Adding OviSync application,
Also Kinetic Scrolling on Main Menu,
Faster GPS Satellite in the Fix,
Overall speed of the system and Opening/Closing application speed also increased.