iPhone 15 Pro Max
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Updating phone software
It's recommended that you update your phone with the newest software, as the manufacturer continuously corrects errors. It's a good idea to back up the phone memory first. Before you can update the phone software, you need to set up your phone for internet.
Press Settings.
Press General.
Press Software Update. If a new software version is available, it's displayed. Follow the instructions on the screen to update the phone software.