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How to update firmware on my phone?
Users can upgrade firmware on their phones by either auto update or manual
update.
*If you do not receive notices on your phone of new firmware updates, please refer
to: https://www.asus.com/support/FAQ/1010274
a. Auto Update
Note: During the update process, please charge your phone with the AC adaptor or
make sure the phone has at least 15% battery life available.
Tap "Check Update" in "Settings" -> "About" -> "System update" to check if the
firmware is the latest version.
If there is a newer version available, please follow the steps shown on screen
to execute the update.