Hi Liam
I have the older version of the Betafpv LiteRadio 2SE before there was an option to get an internal ELRS.
Mine is the FrSky versio, not the Bayang or ELRS verstion.
I believe it is set in FrSky D8 mode because the power button flashes red three times when the radio is powered up.
Is there something else I can do to get the Betafpv LiteRadio 2SE to talk to the RadioMaster R81?
Cheers
Joel Taylor