I am writing a bit of info that I personally collected following the purchase I made.1 month ago I bought the D5121 for my astra gtc, but unfortunately the unit sent me was broken.
Then Eonon started immediately and it was replaced in the end, I can mount it with GREAT
results:
All the steering wheel controls work perfectly
No error code
Excellent touchscreen
Audio quality
Very intuitive menu and easy to customize
Radio stations (not very good tend to frequency disturbances)
Bluetooth is in good connection with your mobile phone for both calls and for listening to songs
on your mobile
In short I am very very happy with this purchase.
only flaw that despite his original cart that comes in the box the radio does not integrate perfectly
with the dashboard on the left side.