Why would they update the MMI for the problem with the DVD drive not reading?
The MMI software does not contain any SW for the NAV unit, only the NAV disk has SW on it that updates the NAV UNIT. So only a newer disk than your existing one would update any SW in the NAV UNIT.
My suspicion is the NAV UNIT DVD drive, so I would replace that under warranty and also eject the disk and check for scratches, they are known for damaging disks.
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