I will show you how to flash Frsky receiver firmware on your R-XSR, R9 Mini, XSR, D4R-II, X4R-SB, XM+ and some other RX. Updating RX firmware is useful when you have the wrong firmware that prevents you from binding, and getting the improvements and bug fixes in the latest firmware.
In this article we will briefly explain the different flight controller firmware options available for autopilots, and mini quad (FPV Racing Drones). We will take a look at the background of these FC firmware, and what they were intended to do.
Here I explain how to flash/update BLHeli_S firmware on your ESC using Cleanflight FC Pass-through.