Nokia 5800 has now,  a new firmware version 52.0.007. There new version has promoted the usability and performance from the previous version.The new 52.0.007 firmware for Nokia 5800 could be downloaded via Over the Air through your phone or by using Nokia Software Updater  or Ovi Suite in your PC.

Nokia 5800 52.0.007 Firmware Update

It is requested to take the backup of your data before having an update to 52.0.007 firmware though Nokia ensures you to have no data lost.

This may not be available in all region and would be soon available.