Did you flash from SD to NAND image 6/5 version?
I know the T9+ has 3 small and 3 big hashboard connectors. T9+ uses the big connectors only. Thought I could install a running s9 flashed controller
but hash connectors are bigger on T9+.
I'm going to play with it.
I only have 2 T9+, would really rather run braiins on them.
Guess I'll boot from SD.

I hope my discoveries are helpful to others.