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C51: Communication using HC 05 in 89s52

First off I am new to all this. I am trying o make a pick and place robot using 89s52 with Bluetooth communication. I am using Bluetooth spp pro in my Android phone. When I press the reset button connected to my MC I am getting a question mark inside a black diamond in the byte stream mode of the application. Please help me out here. Is this a software problem or ckt problem.

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