CADDX GM3 Gimbal not responding

Hello,
I have a CADDX GM3 gimbal which i connected to a pixhawk board, but I still cannot control the gimbal, I followed this instructions on how to connect it in multiple serial ports with no success, I updated the firmware to version 3.4 and tried again with no success. the gimbal is connected to a 3s battery. I will attach my parameter list here
Parameter_list.param (17.7 KB)

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Im thinking on connecting the pwm signal directly but I rather control it with the rx&tx cables.

Any help or point of view would be very appreciate it

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