I have my router (Netgear R7000 with dd-wrt) in N-only mode, my photon does not seem to connect be able to connect to it. It’s just flashing green quickly after pushing WiFi credentials. Same thing with our product which has a P0. However as soon as I switch my router to B or G only modes, it connects without any problems. Granted it might not be the particle devices as I have yet to try with another router but I can connect to the N-only mode with my phone and PC fine.
The device is on version 1.0.1
EDIT: it would seem anything < 0.7 works with N-mode on routers. I wouldve thought this would be addressed by now but guess not.