Here is what I've got, and worked on my 325CI :
Ign Key Off:
Press and hold odometer reset button
While holding button, turn key to Pos 1 (accessories)
Keep button pressed for 5 sec and words "Oil Service or Inspections" along
with word "reset" or "RE" will appear.
Release button and press again for 5 seconds and words "reset" or "RE" will flash.
Release button again and display will flash.
While flashing, press button briefly and it is reset.
....This worked for me, and instructions came off of a MAC tool computer. Let me know if it works for yours.