muskxl

I just bought LD300. I can't use default knob to choose amp model it looks like it does nothing. Channel volume knob somehow does amp model selecting instead . I have resoldered pots and still nothing. For me it looks like it might be software issue. Except that everything works fine. Every function responds and no cracking pots and resistance values are correct. Any one know where to start lookin. Firmware down/upgrade?