Created an account just to reply to this post as i was having the exact same problem. I was trying to flash a X4RSB receiver with non-eu firmware using my Taranis X7, but to no avail. After several hours i started pulling my hair out, was about to give up when i decided to stick that damn servo cable into the “unused” TF port on the bottom of the radio. Pressed “flash ext. device” and to my gigantic surprise it started writing the firmware into my X4RSB. Unplugged, bound successfuly. Correct pin order is GND, +5V, SIG, as on the photo.
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