The latest official firmware version for the Nokia X6-00 (RM-559)

Performance: Reduces system lag and "hanging" during music playback or app usage.

This feature would replace the standard active standby with a modern, low-resource dashboard that focuses on "Dumbphone" efficiency and modern web-lite connectivity. 1. Unified Notification Hub

3. Downgrading or Upgrading Symbian

Nokia released several firmware versions for the RM-559: