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Unlock your iPhone and navigate to the home screen.
Locate and tap on the "Settings" app, typically represented by a gear icon.
Scroll down the Settings menu and find the "General" option. Tap on it to proceed.
Within the General menu, select "Software Update." Your iPhone will then check for any available updates.
If there is an update available, you will see a notification indicating the availability of the new iOS version. Tap on "Download and Install" to begin the update process.
After downloading the update, your iPhone will request your six-digit PIN for installation authorization. Enter it and tap "Install" to confirm.
After starting installation, your iPhone will restart automatically when complete. Upon restart, your device will run the new iOS 17.5 version.