Rlink 2 Phone button on SWC not working on Carplay

[sdade86]

Hello to all!
I have update my Rlink to V9 and activate Carplay.
Initially I couldn't make CarPlay work due to the incompatible USB ports, after purchasing two new USB ports and still not having solved the compatibility problem I decided to try to make a change to make them work (for those interested I can share the modification, but I warn you that you will lose the second USB port and the SD reader)
Btw after the mod Carplay is started (i try wireless adpater and work too). The only problem is Phone button on SWC, in carplay not work for answer/hung up call. I search on google and see some other person having this problem, but nothing abuot solution.
Is a problem only in V9 update? Is it possible rollback form V9 to V8?
Thanks