dudu-lai So I just spoke to my brother-in-law on the phone. He tried all your suggestions. He unplugged all the cables and plugged them back in properly. He also checked the cables for damage. But the cables, etc., are all intact. He also reconnected the old CANbus box, but regardless of whether it's the old or new CANbus box, it always says "unknown CANbus box.
What can we do now? A Dudu7 that breaks the CANbus box every time isn't so nice.
We understand that Dudu7 isn't perfect yet and occasionally has minor issues. But the basic functions should work.