I have just checked on mine and the external MIC option is on that screen in between "Bluetooth device book auto delete" and "Sort Radio by Frequency"
I have an external mic attached.
I suppose there is a chance the software disables that option if it cannot see an external mic connected. I'd offer to check but would rather not unplug it all at the moment.
I think I would check that, plus a factory reset and then be asking Coolcat!
Hope you get it sorted
Mike
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