Hi guys,
Theseus is on sale on Steam and I gave it a try but it dont detect the hmd no matter what I try.
The game start, can access settings and saves but once started it says the headset is not reachable.
Anyone know something about this issue for this game?
Did You try the “Compatible With Vive Only Games” option?
Game might check for specific headsets and fail detecting the Pimax unless it identifies itself as a Vive (“Vive MV”).
Nop, same 
but thanks for the idea 
You have to restart SteamVR after checking the option. It was worth a try…