ZTE ZMAX - Manual (Page 31)

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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:
1. Set a lock screen PIN or password.
2. Charge the battery.
3. Keep the phone connected to the charger.
4. Schedule an hour or more for the encryption process: you must not
interrupt it or you will lose some or all of your data.
When you're ready to turn on encryption:
5. Touch the
Home Key > Menu Key > System settings > Security >
Encrypt phone.
6. Read the information about encryption carefully.
The
Encrypt phone button is dimmed if your battery's not charged or
your phone's not plugged in.
If you change your mind about encrypting your phone, touch the Back
Key.