Your tablet needs to be initialized.

Tap [ Apps & Widgets] - [ Settings] - [Backup & reset] - [Factory data reset], and then tap [Reset tablet] at the bottom of the menu on the right [Details].

• All data in the data storage area is deleted, including the Google account information, the system data and settings, and any app data you have downloaded.

• It is recommended that you make a backup copy of important data because the user data cannot be restored after being deleted.

• The tablet restarts automatically.