iPhone 7 Plus won’t update

kristiens ~ Your iPhone is already on the latest update which is iOS 13.5.1:

About iOS 13 Updates

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iOS 14 has not been released yet.

It was revealed in the WWDC conference but was only made available to developers and special invitees. Its still in testing phase. Developers were give access to make sure their apps work with the new version once it is released.

It will be officially made available to the public sometime in September.

kristiens2 wrote: "iOS 14?"

kristiens ~ iOS 14 is "Coming this fall" [Source: Apple]

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iOS 13.5.1. is the most up to date iOS version available. There is currently nothing else to update to at this point.