I have removed the batteries and cleared the RAM.
When turning on the CNC, the message appears: "OPERATION PARAMETERS ERASED"
I press EXT and the screen goes as in the photo, so far so good
But, when I want to enter a value, what I type does not appear in the parameter value field, the "?" still comes out.
If I enter a wrong value it warns me.

If I put all the parameters on the keyboard or downloading from the PC, they are saved, I turn off the CNC, turn it on and everything is fine but when trying to edit them the same thing happens, that the list does not appear, only one parameter appears and with a value "?" and go to the parameter that goes exactly the same.

If someone could help me, they will appreciate it very much.