WARNING (July 2020) : FrSky released V2.x of the ACCST protocol. If you download and upgrade to that ALL of the receivers and radios will need to be updated. ACCST V2.x IS NOT compatible with V1.X on the majority of kit. See • FrSky ACCST V2 Firmware (D16) won't b... for full details
Download the firmware you need from here https://www.frskyrc.com/download/
Thanks to all who made some great comments on the original video, I've added those into this new version!
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