Konrow COOLFIVE Guide D'utilisation page 44

13. Reset
If you want to reset your smartphone, you can do a reset of
data from the operating system Android™.
CAUTION: A reset data erase all your personal data, all
contacts in your phone and the applications you have
installed. That is why we recommend that you make a backup
of your data before starting the procedure. However the
information stored on the external memory card will not be
erased.
All manuals and user guides at all-guides.com
To do a reset of the data:
The smartphone will turn off and on rebooting the system
will reset.
NOTE : If you have any problem with your device, please try to
reset the system before sending it back.
• In Settings, click "Backup & reset", then "Factory data
reset".
• Click "Reset phone" and confirm "Erase everything".