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Serial settings are 115200 8n1.  But the protocol is very convoluted and difficult to send manually.

From what I gather it looks like the radio is muted by default.  The only site I can find says a 20k resistor from pin 4 in the radio is the mute line.  If you want to try that I’d say pin 4 to ground should do the trick.  If not then to 5 volts, but I wouldn’t try that just yet.  I need to do some measuring on the radio itself.  You could do that if you wanted to.  Use the stock controller and measure the resistance from pin 4 to both ground and 5v.  If you get somewhere near 20k then that’s what needs doing.