LG MS428 User Manual page 82

NOTE
Your personal data from internal phone storage——including information about
your Google account and any other accounts, your system/application data and
settings, any downloaded applications and your DRM licence——might be lost
in the process of updating your phone's software. Therefore, LG recommends
that you backup your personal data before updating your phone's software. LG
does not take responsibility for any loss of personal data.
This feature depends on your network service provider, region and country.
Appendix 81