Followed the instruction speaker with coil I have downloaded many times while played wav file but read "error "every time.l
Later I searched related website and found some post about modem of 8910.There was no magnetic pick up coil on printed circuit board after the remote case was splited apart.
I will talk to the dealer to see if he has one with the modem or posible to diy one . I will make a JP1 cable for late upgrade whatever. After JP1 cable can be used I will try to download file of Beo4.

thank you for all these insructions