Responses to getting the issue resolved were slow and I dont have the time nor patience to beta test the hardware so I sent the P9 kit back. Considering the new PX50 but worried it will probably have...

So TP-Link have got in touch via email to investigate these issues with the P9. I will update here with any progress.

@David-TP any reason why these Deco P9 units prefer WiFi over PLC? Speeds are great when connected to the main Deco unit but the additional Decos are not putting out the speeds I'd expect if PLC was...

Managed to get my P9's updated individually after some messing about. Will report back shortly!

@David-TP Thanks for the quick response I will provide the requested information shortly, just wanted to first test if the latest beta already fixed any of these issues. I downloaded the beta...

@David-TP I think I recall it was you who provided the beta firmware for the p9 (v2) to some users via PM in some older threads. Can you assist? :) Experiencing some slower than expected speed issues...