Nokia X6 firmware updated to version 30.2.005 (RM-551). Its previous software version was 30.0.003.

You can update your Nokia X6 firmware over OTA (Over-The-Air) or by using Windows PC applications  Nokia’s Software Updater or Ovi Suite . The Nokia X6 does have UDP (User Data Preservation), but its always good idea to backup all of your personal data before updating the device firmware.

Note: It may take some time before the new firmware is available for your region.

The Official Changelog is still unknown.

[ Thanks to Addier Alejandro for the heads ]