ZTE T84/Telstra Tough Max - Manual (Page 56)

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UPDATING YOUR DEVICE
Your phone can download and install Software updates.
Apps > System updates
The software update service checks an online server to see if any
updates are available for your phone. If an update is available you can
choose to download and install the update.
Downloading via Wi-Fi is highly recommended. Data usage charges will
apply if downloading via mobile networks. International roaming data
charges will apply for customers downloading the upgrade on a mobile
network whilst travelling outside of Australia.
A firmware update will require a restart of your device.