Problem with my OKK Millcon III (MHA 400 & MHA 300)

I have two machine of OKK Millcon III (MHA 400 & MHA 300). Both has Meldas 83A controller

The machine when bought was not in running condition and was idle for a while

I tried to power up the machinery

Both displays the same alarm E=20 when i try to power on the machine and release the emergency

Moreover I tried to change the parameter which wasn't successful at all

I have been told that it's a software related emergency parameter

I'm not convinced with the reply

I'm open to suggestions

If needed I can send screenshots

P.S. I have the original parameters. But i would like to know the parameter setting procedure. Because however we do it, we couldn't change the parameters other than the M list

Kindly assist