Can the dealer upgrade the firmware in TL 06 to play Mp3 as they would in TL 07 ?.
Is it possible in the first place just like a software upgrade?.

 

Nope, its not firmware.

MP3's require decoding which is done by a chip... While on a computer software can do it in this case its also a chip.

Only way would be get a radio for an 07, but also note that would require to change many other components...

Your best bet is to add you own device...