MES should be able to *increase only* the odometer reading.
Note that it is important to check that when MES is to set an odometer value that it is correct.
e.g. If the current value is 5,000 and you want to set 5,500 and you accidentally put 55,000 then there is no going back. Trying to wrap over the 999,999 value will not work and you will be at 999,999 and no longer incrementing during normal driving.
So if anyone offers to help with MES, or any other capable product YOU MUST CHECK AND VALIDATE what mileage values are about to be committed.