Rogmon

Hi I have a Skoda rapid space back SE Sport owned since new and very happy with it except now the Amundsen MIB2 infotainment system which is ok when i first start up but after about 5 minutes the screen starts to fade more and more till it goes almost black. If I turn it off for while it is ok at first but then starts to fade again. The unit is running train version MST2_EU_SK_ZR_P0241T which I have tried to update to MST2_EU_SK_ZR_P0480T (which I obtained from mibsolution.one to see if this will fix the problem but I can’t install the update as the unit reports the update is too old??. Does anyone have any ideas (1) as to what the fading problem might be and (2) why I can’t install the update. I would appreciate any help anyone could give.