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Varia issue and rollback firmware 8.20

My varia rtl510 struggles to connect to my 530 since the 9.10 update. The light connection is fine, but the radar feature doesn't automatically connect and I have to turn the light on and off a couple of times before it works. This was never an issue the older firmware. 

Is there a way to rollback to the older firmware, 8.20? 
Can I access that file some way? 

Thank in advance to the person who can help :)