Hello.
I purchased and installed the DUDU OBD, but it's not working properly.
My car is a 2013 Korean Grandeur (2400cc), and my Android all-in-one device is a 13-inch 
DUDU7 7870 sold by DUDU.
The DUDU OBD doesn't work properly with this device.
So, I tested it on another vehicle. The test vehicle is a 2014 Korean Sonata LF (2000cc),
and Android all-in-one device is a FYT 7862S.
I confirmed that it was recognized immediately and the DUDU OBD worked properly with this device.
In conclusion, I believe there may be a problem with the DUDU7 OS.
I hope you can investigate this issue and improve it. The attached photo below is a test shot on DUDU6.




The photo avove is DUDU6.
It doesn't work on DUDU7.