ZTE Blade A430 - Manual (Page 25)

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touch FORGOT PATTERN to sign in to the Google Account you
have added on the phone and reset the screen lock. You need an
active Internet connection. You can also upgrade the phone
software. See
Upgrading the Phone Software .
Protecting Your Phone With
Encryption
You can encrypt all the data on your phone: Google Accounts,
application data, music and other media, downloaded information,
and so on. If you do, you must enter a numeric PIN or a
password each time you power on your phone.
WARNING! Encryption is irreversible. The only way to revert to
an unencrypted phone is to perform a factory data reset which
erases all your data.
Encryption provides additional protection in case your phone is
stolen and may be required or recommended in some
organizations. Consult your system administrator before turning it
on. In many cases the PIN or password you set for encryption is
controlled by the system administrator.
Before turning on encryption, prepare as follows:

Set a lock screen PIN or password.

Charge the battery.

Keep the phone connected to the charger.

Schedule an hour or more for the encryption process. You
must not interrupt it or you will lose some or all of your data.