HI
I think the other way is to use some kind of third-party converter software to solve this, so maybe you can use them for convert m4a to wav or to MP3, or ACC and then you can play the music files.
best 
HI
I think the other way is to use some kind of third-party converter software to solve this, so maybe you can use them for convert m4a to wav or to MP3, or ACC and then you can play the music files.
best