This should be helpful, check out the info and video:
https://producthelp.whirlpool.com/Connected_Appliances/Videos/VIDEO%3A_Entering_and_Exiting_Demo_Mode_-_Smart_Appliances
SOURCE: Stuck in Demo mode
The
first thing I would suggest is a hard reset. Unplug the unit for a
minute or so. Then plug it back in, set the clock and try again.
If that doesn't work,
leave it unplugged for maybe an hour.
If that doesn't work, check the owner's manual.
You should be able to
download your Panasonic owner's manual here.
We're
happy to help you with free advice and we'd appreciate your
thoughtful rating of our answer.
SOURCE: Microwave oven (nn-sd997s) stuck in
Pressing "timer/clock" button 4 times turns on and off demo mode.
SOURCE: stuck in demo mode after power outage - any ideas
Talked to GE Help Line (1-800-626-2005) and found out the magic key combination for this microwave. Plug in after being unplugged for at least 30 sec. and then press Help plus Boost at same time for 3-4 seconds (until it beeps). The microwave will now be in normal mode (I assume you do this to put it in demo mode as well).
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