Zte E8 User Manual page 84

Problem
PIN Code
blocked
Phone
crashes,
reboots,
freeze, or
cannot be
powered on
Possible causes
You have entered an
incorrect PIN code
three consecutive
times.
Some third-party
software is not
compatible with your
phone.
84
Possible
solution
Contact your
service provider.
If the service
provider provides
the nano-SIM
card's PUK code,
use the PUK code
to unlock the
nano-SIM card.
Uninstall the
software that
may cause the
problem.
Upgrade the
phone software.
Reset the phone
to factory status.