[TT Sync Controller]

Anyone have any idea if I could populate all 9 hubs with tt riing trio fans?  I saw a youtube video saying it's possible but on the official site, it says you can only populate 4 fans.

[TT RGB Plus]

I currently have 25 Riing trio fans installed with 5 controllers and using v. 138.  The issue I have is the software is unable to detect the last controller (#5) but all other controllers (1-4) are being detected.  Does anyone here having the same issue?  I have tried replacing the controller but still the same result.  Any fix for this?