Does it actually say Nano on the remote ? because TM use pretty much the same remote for all boxes with different codes for each. The Base 4D image by Technomate (although they will tell you it is nothing to do with them) carries a app to change the RCU code via the receiver like the Vu+ one does in ViX but ViX does not have this one for TM boxes within the image.
Also try checking the remote is actually working, Hold the remote up to a cell phone in camera mode, then press a few buttons on the remote. you should see a white flash on the phone screen as it detects the IR signal. If you dont see this flash the remote control it self is faulty, if you do then it is running the code for a different TM receiver.