Here are two articles for iOS and Android on how to update your device.
Android - https://hbogamessupport.wbgames.com/hc/en-us/articles/360001088248-How-do-I-update-the-game-or-my-Operating-System-on-Android-
iOS - https://hbogamessupport.wbgames.com/hc/en-us/articles/360001083387-How-do-I-update-the-game-or-my-Operating-System-on-iOS-
If you need additional assistance, please contact WB Games Support by clicking “Ask for Help” above.
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