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Sony mhc-ex8t stuck in Demo mode

My name is Henry from Nairobi, Kenya. Am a technician dealing with an average number of electronics but am a hobbiest when it comes to audio equipments.
I have encountered a similar case before where by the owner wasn't patient enough. Now here comes my second case.
This unit is stuck in demo mode. No key or remote commands are doing any change or response. I have tested the voltages and they seem stable.
Am stuck...kindly assist. Thanks