hi, i am a new member and have a question or two.

firstly the background my car is an e38 2000 (i know this is an X5 forum but have been advised to ask for help here) fitted with mk111 nav unit OS showed 3 1/63 everything was ok untill i thought a freind in the know could upgrade my OS not realising that what i had was good enough, he accidently put in a dvd OS for mkiv. at first it would not eject the dvd, screen went blank no splash screen all though radio works finally it did, after waiting for 1/2 an hr with ign key out screen works but no splash screen and now the sat nav option does not appear in the menu and i assume without this i cannot upload any OS.

HAVE WE RUINED THE NAV UNIT ???? OR CAN SOMETHING BE DONE this will teach me to leave well enough alone and i went to him to buy a tv in motion cable!!! please please please HELP