I've received my replacement CANbus box as well. Installed it today.
Backup camera zoomed in problem is FIXED! After driving around a bit even trajectory works!
I asked my vendor about getting a new CANbus reader and they sent one to me right away. Didn't get much information out of him though.
In any case I'll put it in as soon as I get it. Let's hope it works.
I didn't install mine with the external microphone. The one built into the screen seems to work fine. Haven't called anyone from it though, just tested the built in mic with a recording app.
Installed one of these in my car and so far very happy with it!
Only thing bugging me is the infamous zoomed in camera view, hope someone can find a fix.