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3.
Click
Screen lock
.
4.
Choose
PIN
in text setting area.
5.
Enter new PIN code(numbers) and click
continue
.
6.
Ener new PIN code again and click
confirm
.
Set unlock password
Click
setting application
in main interface.
1.
Click safe.
2.
Click screen locked.
3.
Set password in text seting area.
4.
Set new password(letters and numbers) and then click continue.
5.
Enter the password again and the click
confirm.
Unknown source
1.
Click
setting
application in main interface.
2.
Click
Security
.
3.
Click
unknown source
,
as Picture 4.24
Picture 4.24
Note: Manual installing APK files needs to turn on unknown source.