Mercedes-Benz COMAND Operator's Manual page 206

Navigation*
Software Updates
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Insert the new navigation DVD into the
DVD slot with the label side up.
The message Navigation is
initializing. Please wait.
appear.
Press l on the display unit to return
the display unit to its closed position.
The display unit tilts up and then moves
to the rear.
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Inserting a second DVD with another
DVD still loaded will cause damage to
the DVD drive which is not covered by
the Mercedes-Benz Limited Warranty.
will
After that, the COMAND loads the
software on the DVD.
Shortly after that, the progress bar
appears. After some time, the progress
bar reaches 100%.
The update is completed. You can now
operate the navigation system again.
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The message Press EJECT to
will appear. If l on the
close
display unit is not pressed within 20
seconds, eight successive series of two
beep tones will sound to remind you to
return the display to its closed position
by pressing l on the display unit.
If you do not do so, the COMAND
returns the display unit to its closed
position.