DFROBOT Gravity voice recognition module config issue

Hello everybody!
I'm building a countdown timer that can be started by shouting commands to the mentioned voice recognition module. All fine so far, except the initial configuration for the module.
According to the setup-guide ( SKU_SEN0539-EN_Gravity_Voice_Recognition_Module_I2C_UART-DFRobot) I should be able to configure volume, mutemode and so on during startup.
When I power on the Arduino, the module ignores the changed parameters.
When I then press the reset-button on the Arduino, all works as expected.
I tried to add some delay because I guessed that the commands are issued to early and the module is not powered fully up at this time, but no success so far.
I'm using the code from the mentioned example, just changed parameter values from 0 to 1.
Any idea what I could try to solve this? Thanks a lot for any help and best regards!

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