DMG DMU 50 Evolution machine constants

Hello everybody, my name is John and I live in Greece. I have recently purchased a DMG DMU 50 Evolution 2000 built. It is in good mechanical shape and very little used. When I power it up it only showing 3 axis and not the 4 and 5 axis. I believe this is do to machine constants have been wiped out and the controller has now the defaults constants.




I am trying to enter the menu to edit the constants but the controller wont do anything when I press F8 (menu) or Alt. Also the arrows wont work either. I know the keys are working because when I press them it goes out of the black and white screen saver, the controller just ignores them.

I have printed copy of the constants and backup hard disc of Millplus but I don't know where is the plc program, is it in the hard disc or in some chip in the controller. Should I replace the battery insight the controller or I may loose something very important?
Also I can make a copy of hdd or constants ans sent it to anyone need it.

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