@thedroneracingpilot, you have the wrong flash selected, you need to be in Flash S-Port, that is the one that goes out the bottom of the radio. Internal is the internal XJT board, external is a module in the JR bay in the back top of the radio, and SBUS is the pins on the bottom left of the SD card. You only need to touch the solder with the pins to get an electrical connection and hold it steady for the 30 seconds it takes to flash the RX, if it starts and then fails you lost contact for a second, just try again, if it fails to communicate then you have the pins on the wrong pads or not connected enough for the radio to see the RX. In this instance only, SBUS and S-Port are the same.