Did the flashing a while ago. The whole process took less than 10min to complete. Pretty fast for a 240MB firmware.
The album cover art is working well, play all is working too. Albums which could not play previously are now recognised and played perfectly
The 'always on top' bug is now gone. Going one level back brings you to where you have left. So no more scrolling all the way again from top.
However the album list is screwed. Compilations with multi singers are now recognising each song as separate album. Kind of irritating.
Definitely an improvement and now I enjoy DX50 more.
It will be better again with subsequent firmware release. Looking forward to this!