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picasso1850 Respectfully I disagree with you. When you buy a phone do you get a manual for every setting? No you don't. Nor a description. I know that the learning curve of Dudu OS could be very steep sometimes, but it is the same thing as with the phones. You have to play with the settings to see what every setting does. And most of the settings that don't have the explanation sign (?), have a very easy to understand graphic description. You have the wiki guide. May I ask how many times have you read it? Because like Dudu, many electronics producers do not provide a manual anymore but simply a QR code that takes you to the online version of the manual. I don't know if you owned other Chinese head units before. But believe me that the wiki guide is much more complete than what you get with the other brands. For the bugs you have this forum or the Telegram group where the community is much bigger and I bet you'll find your answers much faster there than here. But it is everyone's choice.