deutz 5 series isobus problem

anyone have a deutz 5 series with isobus? i have a problem where my terminal is unable to pickup the speed, tested the terminal in a 7 series it works fine

the dealer replaced all the electronic wiring, along with the isobus ecu and main ecu, still nothing, there is nothing else left to replace! getting annoyed

was wondering if anyone else has the same problem

thanks