Zte Telstra 4G User Manual page 19

The Encrypt tablet button is dimmed if your battery's not
charged or your tablet's not plugged in.
If you change your mind about encrypting your tablet, touch
.
WARNING! If you interrupt the encryption process, you will
lose data.
7. Touch Encrypt tablet.
8. Enter your lock screen PIN or password and touch Next.
9. Touch Encrypt tablet again.
10. The encryption process starts and displays its progress.
Encryption can take an hour or more, during which time your
tablet may restart several times.
11. When encryption is complete, you're prompted to enter your
PIN or password.
12. Subsequently, you must enter your PIN or password each time
you power on your tablet, to decrypt it.
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