FrSky ultra mini receiver R-XSR is the evolution of FrSky full range XSR receiver. The R-XSR is a standalone receiver with all the functions of XSR, in addition, it is almost 1/3 size and 1/3 weight of XSR receiver. Moreover, the redundancy function is integrated into this tiny receiver ensures the security, and the IPEX connector makes it more convenient for you to replace antennas.
See our video on flashing - it's the XSR but the procedure is the same and the R-XSR comes with a cable that you can use.
Pay careful attention to the wiring order, which depends on which radio you're using to flash - order is correct for the Q X7 but NOT for the Taranis X9D+
Link to manual here