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the FrSky FR-USB3 pcb tool is normally used in conjunction with the FR-SPC (sold separately HERE) - to update the firmware of an X4R X4RSP or of any FrSky Smart Port device including D4R-II and X8R receiver etc
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Note : Instructions - the update process to update FrSky Firmware on devices such as X4R is found here
How to Update the firmware for FrSKY X4R to CPPM : To avoid any issues - be sure to do your X4R connection sequence exactly as per the MWC Team method below -