Hi guys,
first post on this wonderful board! I got a Betafpv 95x v3 with a TBS Crossfire Nano module. I had to replace my FC after a crash and now my crossfire nano binds with a solid green light, but no inputs that are recognized in Betaflight. I sodered the battery connectors the wrong way round and connected it for like 0.3 seconds since I was paranoid about smoke. It seems to work fine in every way though. I also got a new crossfire nano module since I thought it might have been damaged by the wrong battery connection. I flashed the same firmware with the same target as on my previous FC where this exact setup worked. The Crossfire Nano gives me a solid green light (bound according to the manual), but no inputs in Betaflight register.  I also have the exact same model on my Tango II remote which runs firmware 6.10 (which previously worked). Can you give me any advice what might be wrong?

PS: a dump all should be attached.

There is no dump attached to your post. Can you please try attaching that again and also post a "diff all" as well.

(21-Jan-2022, 10:10 PM)SnowLeopardFPV Wrote: There is no dump attached to your post. Can you please try attaching that again and also post a "diff all" as well.

Sorry, now it should be attached. I noticed that the target for the flight controller used to be BetaFPV405 (not OMNIBUSF4SD, as many internet posts suggest) and that used to work. So I reflashed the firmware and set everything else as described, but the problem persists.

What UART do you have the Crossfire Nano RX wired to?

Some good clear photos of the wiring and connections between the receiver and the FC would also be useful so we can double-check that your wiring all looks to be correct and in order.

EDIT: Your attached CLI dump also still shows the OMNIBUSF4SD Betaflight target. If you have now re-flashed the FC to the correct BETAFPVF405 Betaflight target, can you please attach a new CLI dump for that so we know we are looking at up-to-date settings.

(22-Jan-2022, 08:11 PM)SnowLeopardFPV Wrote: What UART do you have the Crossfire Nano RX wired to?

Some good clear photos of the wiring and connections between the receiver and the FC would also be useful so we can double-check that your wiring all looks to be correct and in order.

EDIT: Your attached CLI dump also still shows the OMNIBUSF4SD Betaflight target. If you have now re-flashed the FC to the correct BETAFPVF405 Betaflight target, can you please attach a new CLI dump for that so we know we are looking at up-to-date settings.

Problem now solved, see Edit 2.

Hi again and thanks for your patience!
On my FC I use UART3, which is a plug. This used to work and I did not change the wiring from the original one, except that I soldered a cable for the SMO4k to another UART (1), see here:    


What I labeled as UART1 in the picture is R1/T1 on the FC, but I don't see those in Betaflights ports tab. Not sure what that should tell me. Lastly, the actual, new CLI dump is attached.
  troubleshooting_BTFL_cli_95x_v3_20220124_100134.txt (Size: 35.66 KB / Downloads: 71)

I tried to find as much information about this as possible and think I should perhaps try another UART? Again, thank you so much for your help!

Edit: Here is the recommended wiring and Betaflight settings, which is exactly what I set up now.    

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Edit 2: I solved it. It was both really easy and yet so well hidden for a beginner like me. On the screenshot of the setup manual it says "solder the pads as is shown" (at the DSM and SBUS pads). In the picture there is a black dot over two of those. When I looked at the new FC, there actually was some kind of small chip, connecting the other two. Luckily, I had my old FC lying around. That had no chip and the soldering done as in the picture. So I scraped off the small connecting chip and connected the pads as shown in the manual. Then it worked. I think it is not clearly communicated in the manual and the fact that I had to scratch off that small chip between two pads did not give me much confidence. Maybe another beginner sees this  and gets the problem solved. Thank you for taking my noob problem serious, SnowLeopardFPV! I feel kind of dumb about the solution, but yet it was kinda tricky.