Nokia G21 user guide
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Update your phone software
Stay in step with the beat – update your phone software and apps wirelessly to get new and enhanced features for your phone. Updating the software may also improve your phone performance.
Install available updates
Tap
When your phone notifies you that an update is available, just follow the instructions shown on the screen. If your phone is low on memory, you may need to move your photos and other stuff to the memory card.
Warning: If you install a software update, you cannot use the device, even to make emergency calls, until the installation is completed and the device is restarted.
Before starting the update, connect a charger or make sure the device battery has enough power, and connect to Wi-Fi, as the update packages may use up a lot of mobile data.