F3F models are amongst the most demanding in terms of programming. Over the years, I've programmed a variety of radios for this task. These include the Futaba FF7 Super, MPX 3030, MPX 4000, MPX Royal Evo, MPX Cockpit SX, Futaba 12FG and FrSky X9D+ running OpenTx. More recently, on a FrSky X20 running Ethos.