You can update your Nokia E52 firmware by OTA (Over-The-Air) or via Nokia’s Software Updater, Ovi Suite on Windows PC . The Nokia E52 does have UDP (User Data Preservation), but its always a good idea to backup all your personal data before updating the firmware.
Note: It may take some time before the new firmware is available for your region.
Changelog for Nokia E52:-
- Performance improvements
- Usability improvements