I want to update my iphone to iOS 17.2.1
How to update the iPhone
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First see if your iPhone is compatible with iOS 17:
You'll need to have an iPhone XR/XS or newer for iOS 17.
If you don;t have that iPhone version your iPhone is too old and is not capable of running iOS 17.
If you have a newer iPhone , please go to settings>general>software update and make sure that low power mode is turned off and that your device is connected to a wifi network
See this user tip I've written for further reference on updating