1. Install kindle(APP), and the tablet is Huawei Enjoy Tablet ags2-w09.

2. After opening, you can see that there are no books, and then close the APP.

3. Select the e-book files in azw3 and mobi formats. I use A Zheng Yuan Jie's wisdom teeth here, and the format is azw.

Copy files with the file manager that comes with Android and paste them into internal storage.