First, open Baidu search, enter "Apple China" in the search bar, and find official website of Apple China after the search, and click enter.
Second, click the "technical support" option after entering.
Third, then find the "Service and Maintenance Information" column under Service and Maintenance Items, and click Enter.
Fourth, select "iPad" after entering.
5. Then find "View your security status" and click Enter.
6. Enter to enter the serial number of the tablet.