What is the highest iOS I can run on iPhone 6 Plus?
What os running on iphone 6 plus..i can not install some apps how can i reserve that problem
[Re-Titled by Moderator]
iPhone 6 Plus, iOS 12
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An iPhone 6 plus can't be updated beyond 12.5.5, it doesn't have the hardware needed to run anything higher.
If you need a higher iOS version, you will have to purchase a newer phone.
iPhone models compatible with iOS 15.5 - Apple Support
