One more thing to be mindful of: order of connection and startup is important and iFTx is quirky.
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I would start with the radio "cold and dark" and the iFTx app force-closed, with the radio disconnected. Plug the adaptor into the phone, then the USB cable from the adaptor to the radio.
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From here, things get murky for me but try starting the radio up next, THEN opening the iFTx app. Failing that, go back to "cold and dark" and instead of starting the radio first, open the iFTx app first, then switch on the radio.
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I also tend to force-close the iFTx app frequently as it can lock up from time to time.
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Also ensure cables are well and truly RFI choked - that has shut me down on more than one occasion.