OPPO A77
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Set date and time
It's important that the date and time are correct as some phone functions won't work.
Find "Date & Time"
Tap Settings.
Find "Date & Time"
Tap Additional settings.
Find "Date & Time"
Tap Date & Time.
Turn on automatic date, time and time zone update
Tap the indicator next to "Set Automatically" to turn on the function.
Return to the home screen
Tap the Home key to return to the home screen.