Checking Bluetooth Functionality?
You can check if your radio has the proper Bluetooth functionality using your phone. If it's setup as Slave/Bluetooth it will advertise and you can see it via a Bluetooth scanner app. You can see what it's advertising and also connect to it and see the data. When using this normally we want the Head Tracker be sending the information to the radio so you will set your radio to Master/Bluetooth (receive mode).
Install an app on your phone called BLE scanner or NRF Connect (Android). Apple should have similar apps. I'm sure there are many others too. Photos shown are on the Taranis 2019 X9D+ SE but other OpenTX radios are similar.
Under the Radio->Hardware page set the Bluetooth mode to Trainer. (Long press menu to get into the radio setup page, then press Page until your at hardware)
Under your Model Setup page, set the trainer mode as Slave/Bluetooth
Use the scanner app to find the transmitter and connect to it. It will have the name "Hello"
It will show a list of Services, look for the Service 0xFFF0 and expand it.
It should show a Characteristic 0xFFF6. Open it
There should be a button for notify on your phone. Click this button and you will see all the channels data being sent should start with 7E80..... If you move the sticks around you will see the data change. If you see this data it should work.

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