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What is the model number of your thermostat?
Ok, but I need the model number if you want unlock instructions. A call won't help if I don't know which Emerson thermostat you have. They made hundreds of different models.
Some models unlock if you press and hold the Menu button for 20 seconds. You have to keep it held down for at least that long
Did you try holding down the Menu button for 20 seconds?
I told customer service you want a refund