Firstly,I downloaded the image file from the official website.
As you see,it's a correct version.
Then,I Write the image file to the SD card.
At last,I copy three files to the root directory.
I'm sure these three file are matched with my device.And I I compared my production amount of SD card and successful SD card file size is the same.But the system always faid to start.If I use the official SD card,it's OK.
I want to know which step is wrong with my SD card production?I have compared the step of official web many times.
Thank you very much!