I've 'upgraded' my old K750 into an W800i without any problems except one:

The firmware R1BC002 can't handle ID3-Tags in AAC-Files (.m4a), the walkman-player shows only the filenames, not the Tags

With MP3-Files everything works fine !

Does anyone have the firmware R1BD001 (the newest one) and can check wether the prob exists also with this firmware ?

Thx in advance for input