A scope will also indicate if the Sbus is active and transmitting
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When you changed the wiring to RX5 did you also change the Uart5 to Serial RX in Betaflight?
I did, dont understand as it connects to the controller and the goggles ?
Think Ill go back to basics and double check the wiring config just to make sure…
Because on the DJI FPV system the controller connects to the goggles independently. The Sbus doesn’t connect the controller to the FC directly it connects the Vista which relays the controller signal to the FC.
If you have another Vista you can try connecting that to the FC on your Firefly to see if it works. If it does then you have a problem with the Vista (probably the Sbus diode)
With your meter test the resistance from the vista Sbus pad to ground
Take a picture of the meter reading and the probe connections
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Isn’t sbus inverted? So needs a dedicated pad?
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Yeah but we think Nick has an F7 FC
Think Im going to try the above and test it with another vista that way I can eliminate the vista or not.
Cant believe it, Iv gone from 1 quad out of action to 3 in the blink of an eye 
does me head in 
Cheers Richard was going to buy one sometime back but thought for the price it would be a pile of crap
but no it’s not
It is a great bit of kit for the price 
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Yeah as long as you don’t expect too much then its a great aid.
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Now quick Q as just to check im not getting thing arse about tit, iv re soldered Sbus to RX5 hence I would change it to serial RX5 in Betaflight ???
yes.
Another long standing member lost 
GADC mug on the table though, so you’re forgiven 
My Daily Mug
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Ok took the advice above good news odd news.
I hooked up the vista out of my Apex which is also on the bench, I wasnt sure if it was working or not but it turns out it was 
so I now know its the FC that’s US …
The firefly did power up the odd thing was 3 of the motors started chirping
Hang on a minute, so a different Vista worked ok on the Firefly?
Maybe Iv not explained properly, yes it powered up but none of the switches still dont work but not sure if they would if the motors are chirping ??
Does that make sense???