How to download iOS 13.4
How to download iOS 13.4 to download apps
iPhone 6, iOS 12
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You appear to have an iPhone 6 with iOS 12 installed on it. Your iPhone 6 cannot be updated any further. This is because it does not have the necessary hardware to run higher iOS versions efficiently. You will need a newer model iPhone to install iOS version 15/16.
Axel F.