I found another 5 series that matched your vehicle.
I hope this will help you to get that reset to work. If after this it still does not work you can try the battery reset and attempt again. If it still does not work then it might have to be reset using the diagnostic tester from the dealer. However, this should work.
To check to see if the microfilter needs to be reset it should be yellow or red on this screen.
The first step is to leave the vehicle off. Get in, shut the door, and buckle the seat belt.
Without starting the vehicle put the key in and press the start button twice so all of the cluster lights come on. Then press and hold the left cluster button. A triangle and exclamation point should show up.
If this display comes up then a step was incorreclty done and it will need to be started over.
Continue to hold the button unil this display come up depicting brake fluid. This is the first item that can be reset. If you continue to hold the button it will go to the wrong test screen and if you wait too long it will go back to the main display. In both cases it must be done over from the beginning by cycling the key off.
To scroll through to microfilter just press the same left cluster button with a quick press and release. Once at the microfilter you have to hold the button down until it shows RESET and then immediately let go and press it again to finalize the reset.