you don´t have the "DiG Out" this is an iGyro funvtion. Not in the Royal SRS.
Check that you have turned of the DG1 and DG2 channels in your tranmitter (no switch assignment). Take a regular channel- lets say Channel 16 and assign a 3-point switch. You must see in the transmitter servomonitor the switch moving from -100% / 0% / +100%
After this take channel 15 and assign a slider to this channel for the Gyro Gain. Make the travel to -105% / 0% / +105%
Then start the Gyro Basic setup assistant.