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Version WW- 15.2016.1902.340. If your phone isn’t on the above stated firmware version you can download the same from here: https://www.asus.com/Phone/ZenFone-Max-Pro- M1/HelpDesk_Download/ After Updating your phone to 15.2016.1902.340 you can start Android Pie update. PC Version: 1.
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4. If the Update notification doesn’t show up, reboot your phone and check for the firmware update notification pop-up on the status bar.
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Tap "System Update File Detected..." and follow the steps shown to update the firmware.
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Mobile Version: 1. Download the file from the provided link: 2. Open Downloads Folder or the Path where you have downloaded the File, by default the path is always downloads folder. 3. Move/Copy the File to Internal Storage of your Phone.
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4. Once the File is in the internal storage the update notification should arrive or else restart your phone. Note: 1. The Battery should be Minimum 30% charged before you update the device. 2. The Zip file need to be downloaded in one attempt as the file maybe corrupted if the download fails in between.