Geeetech

Hello everyone,
I'm a student and currently I'm working on my thesis based on an Arduino Uno R3 and I want to use the Geeetech Voice Recognition Module. I was having some problems, mainly with the sound part, but generally everything seemed to be working. I recoreded some commands and i focused on the coding. The problem is that today, when I connected the module and powered up the Arduino, i sent the 0xAA 0x00 command and I didn't get any response. All the hardware parts seem fine, I checked it many times, as well as the baud rate etc. I also tried other commands, but still I don't get any response at all... Any ideas?

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