Downlaoded wav file into remote but read "error" .Someone mentioned that there is a mirophone inside remote on back of the board but after I opened back cover of the urc-8910 there wasn't a phone (I got cheap one).The J1 was connected nothing.I think J1 is for mirophone. Are there any components can replace this mirophone by connecting J1 or somewhere.
Can JP1 cable load beo4 file to make upgrade If I DIY a JP1 cable.

thanks