Cài lại iPad để xóa toàn bộ nội dung và thiết lập.

I'm interested in that, but I only have a few mins. Can you give me at most the first 500 characters of a detailed explanation in English about that?
Launch the Settings app again and tap "General." Scroll down to the bottom of the screen and click "Reset." Select "Erase All Content and Settings" and confirm your selection when prompted.Your iPad should return to its original factory settings once the process is complete.