P3P Gimbal Dial Stopped Talking to Bird

I have made some progress and I am close to having both P3P's back in the air, I hope.
It seems RC firmware 1.6 or 1.8 work fine with AC firmware 1.10.9
I just need to downgrade one of my AC's back to 1.10.9 from 1.11.20
When using RC 1.6 or 1.8 with AC 1.11.20 the signal is very garbled and the indicator light on the RC blinks inconsistently. The video link is extremely poor and the signal keeps dropping.

I am now going to look around the forums here for a link to AC firmware 1.10.9 - My fingers are crossed that downgrading this AC will not result in a brick or some other unforeseen issue!

Thank you all for the input so far.
 

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