User's Manual

13
Troubleshooting ..............
Before contacting the service center, you are advised to follow
the instructions below:
• You are advised to fully charge (
) the battery for optimal
operation.
• Avoid storing large amounts of data on your phone as this may
affect its performance.
• Use the FOTA (Firmware Over The Air) Upgrade tool to update
your phone's software. To access System updates, touch the
Application tab from the Home screen, then select System
updates or touch Settings\About phone\System updates.
Touch
and the phone will search for the latest software. If
you want to update the system, touch the
button, and when
that’s finished, touch to complete the upgrade. Now your
phone will have the latest version of the software. You should
turn on data connection or Wi-Fi before searching for updates.
Settings for auto-check frequency are also available once
you restart the phone. If you have chosen auto-check, when
the system discovers the new version, a dialog will pop up to
choose download or ignore, the notification will also appear
in the status bar.
During FOTA downloading or updating, to avoid errors in
locating the correct update packages, do not change your
default storage location.
• Use Factory data reset and Mobile Upgrade tool to perform
phone formatting or software upgrading (to reset factory data,
hold down the Power key and the Volume up key at the same
time under power off mode). All user phone data: contacts,
photos, messages and files, downloaded applications will be
lost permanently. It is strongly advised to fully back up the
phone data and profile via Smart Suite before doing formatting
and upgrading.
Please pay attention that after Factory data reset is performed
you may be requested to enter Google account credentials
(1)
that were used on this device before Factory reset. Otherwise
you will not be able to use the device. If you don’t remember
your Google account credentials please complete Google
account recovery procedure. In case you don’t succeed in it -
please apply to authorized repair center, but remember that it
will not be regarded as warranty case.
and carry out the following checks:
(1)
Applicable for Android OS versions starting from 5.1.