The following changes and improvements have been made to the FW1.4.3 compared to the FW1.3.0 on M3K:
1. Added a new "Cover display" setting item under the Play Settings to control whether the Playback screen and Lock screen will display the Album cover or not.
2. Added a new "Lyrics display" setting item under the Play Settings to control whether the lyrics are displayed in the Playback screen.
3. Added the "Replay gain" setting item under the Play Settings to turn on/off the replay gain function.
4. Added a new "file name display" setting item under the System Settings to switch between title/file name display.
5. Added "All Songs" under Category -> Artist, which brings together all the songs of the selected artists.
6. Fixed issue where the M3K may restart automatically when playing a particular type of tracks.
7. Fixed issue where holding the Return key would take effect even when screen is locked.
8. Improved the system stability
M3K - FW1.4.3: click here
How to upgrade the M3K: click here