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open the cabinet above the microwave and you will see the screws that go down through the cabinet to secure the microwave, they are Phillip head, have someone hole the microwave in the front and take the screws out, then let the front drop down and lift the back off the back plate. it hooks on, then slide the whole thing out, this is the back mounting plate thats on the wall behind the microwave. the long screws in this picture are the ones that come through the cabinet inside.