Hello, although it was warned here at the beginning not to access code 9191, someone entered the code and even asked the question "If you access Code 9191, what is the solution to the problem" Now "Device No Activated" appears on the tablet display. Personally, I hadn't had time to read this warning and I didn't remember the access code 8878, so I put what came into my head. And yes, this very 9191 and 1515 (it was not listed in the table) I think because, as you can see in the photo, every time I turn on the device, those two options appear in Chinese. I used the translation and it says on the left "System Hint - No file was found - Try again", and on the right the option "Return". If I access the left option "System Hint" nothing happens. If the option on the Right is accessed, the device enters normal operation mode, but be careful, "Device No Activated" is permanently displayed and from time to time the two Options appear again in Chinese. As Torsten also said, I think the device needs a certain file. He says this is called "file called license.dat" Now I ask once again: Has anyone else gone through the same problem? If so, can you explain or post the solution or better that missing file "File called license.dat"?