Hi! Good there was at least some use for my failure (I mean pictures fixed and others will do better).
As for my receiver - nope, nothing lights up when I power it up.
First time after connecting and getting "firmware update error" (before I realized the polarity was wrong) I powered the receiver up and got both green and red LEDs solid, that's when I started suspecting something went wrong. The next time I connected it correctly to the Taranis I got the same error, but after that LEDs wouldn't light up again.
So I suspect the voltage regulator got fried (at least I hope it's the only thing fried ), will verify that later. In the meantime ordered a bunch of XC6201P332 (will arrive in something from a week to a month and a half).