Well I am setting up a XP8, T2C amd T3V system currently... I have the same wierd issue with communication... (like my Nevo system)... I am pre-building the system... My issues are that the signal is transmission works intermittently and I cannot get the two-way to work... I have gone through everything as well. I will say one thing... HOW DO you do a firmware update.. I followed the intructions and system designer as well pretty much told me I was an idiot... It actually states to push the "select" button... Good to know I am not the only one... Oh well looks like another buzy weekend...