Good news ! I've been in contact with a kind person from yamaha music branch italy, and he gave me the necessary to upgrade the sistem firmware from the old 1.12 to 3.0 (floppy disk + CDROM) Then i used lan connection to update the system with prc-100 at the latest 4.2 !!! Now the app on iphone works fine, wherever at home i am able to control the piano and the library much easier. Thank you again for the support Best regards :)