Need Appliance Repair Help? Ask a Technician for Answers ASAP
So unfortunately the refrigerator going into demo mode on it's own is the most common failure for this refrigerator and if it won't exit by pressing and holding the Energy Saver and Power Freeze buttons together, then your front display board itself would need to be replaced because it has just failed.
I can not control what needs to be done to repair the refrigerator. I have told you the only things that will work. I could tell you all sorts of button combinations that will do absolutely nothing, but what would be the point in that? You may think that it's only worth your money to know of other things to try, but I think it's worth your money to understand that you can stop looking for other things to try and just replace the display board since that is the only option left at this point.
have a nice day.