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Factory data reset
Erase all of your personal data from internal phone storage, including information
about your Google account, any other accounts, your system and application settings,
and any downloaded applications. Resetting the phone does not erase any system
software updates you’ve downloaded.
If you reset the phone in this way, you’re prompted to re-enter the same kind of
information as when you first started Android.
When you are unable to power on your phone, there is another way to perform a
factory data reset by using hardware keys. Press the Volume up key and the Power
key at same time until the screen lights up.
10.4 System
10.4.1 Date & time
Use Date & time settings to customise your preferences for how date and time are
displayed.
Automatic date & time
Touch the switch to use the network-provided date and time.
Automatic time zone
Touch the switch to use the network-provided time zone.
Set date
Touch to open a dialog where you can manually set the phone’s date.
Set time
Touch to open a dialog where you can manually set the phone’s time.
Select time zone
Touch to open a dialog where you can set the phone’s time zone.
Use 24-hour format
Touch the switch to display the time using the 24-hour clock format.