Maybe I have an idea of the OSD problem origin: When I initialized the xvr I only had one camera attached. I now only have the option of one or 4 camera views on the wifi (I have a full 16 cam view on the directly attached monitor and on the techpross phone app (adjusting settings I have lost the phone connection for the moment but it was working for 16 camera view).
How to fix?
I am hesitant to use the QR codes for phone control: security of phone, small keyboard size of phone, etc.