There is a patch for the 750V for the audio on WM5 on the EU side of the Palm website.
However, since you upgraded to WM6, that's a moot point. WM6 includes the audio patch.
Is all audio dead, or just the loudspeaker? Does it work with headphones? If you're getting playback on headphones, but not on the loudspeaker, then it may be a hardware issue related to the speaker. |