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Are you sure you have an iPhone 11? My iPhone 11 runs iOS 18.5 fine and is reportedly going to support iOS 26.

• kstrauser 1y ago
  You're right, according to https://www.apple.com/os/ios/ https://www.apple.com/os/ios/ .
  • system2 1y ago
    Well, mine doesn't go above iOS 17. I triple checked it now.
    • kstrauser 1y ago
      It does: https://support.apple.com/guide/iphone/iphone-models-compatible-with-ios-18-iphe3fa5df43/ios https://support.apple.com/guide/iphone/iphone-models-compati... You might need to download an image and install it via a computer if you don’t have enough free space or something.