Car: a class 2012 w169
Comand unit: ntg 2.5

Problem is that every time the car is started there is a message about navigation map is not suitable on hard disc etc. It just appeared one day, I did nothing. I dont need navigation but it takes cca 2 min to start the radio and I have to manually press ok to remove the massage. At Benz service they wanted to flash it but dont give guarantie to work and after I still need to buy new maps. Its too expensive just to try something and they dont know if it will work.
I tried: reset, disconnect the battery, even I have checked hard disk for bad sectors and it shows no bad sectors, tried to start the unit without hard disk and still there is the message and delay.

So if anyone has any idea what can be tried let me know. At this point I wont give 500e to mercedes to flash it so next step is to buy new android radio if this cant be fixed.