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FOTA upgrade
Use the FOTA (Firmware Over The Air) upgrade to update your phone's
software.
To access updates, from the app list, tap Settings > System > System
Update. Turn on data connection or Wi-Fi before searching for updates.
With Wi-Fi turned on, the system is able to discover if a new firmware
version is available and if so, begin to download and install it automatically.
Once finished, a pop up dialog will give you the option of restarting your
phone later, overnight or now.
If Settings > System > System Update > Update settings > Automatically
update is turned off, a pop up dialog will ask if you want to download a
new firmware version which the phone has discovered, or if you want to
ignore it.
If you only have a mobile network connection, you will only receive a
notification which will appear in the Status bar.