Cannot update iPhone 6. It says ph is up to date which is iOS 12.5.6
How to update my iPhone 6 but alr connected with iTunes pc not says it’s also upto date which is iOS 12
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An iPhone 6 can't be updated beyond 12.5.7, 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.
To update to 12.5.7 _
Go to Settings > General > Software Update.
This link will show you how to update your iPhone, iPad, or iPod touch using WiFi -
Update your iPhone or iPad - Apple Support Update your iPhone or iPad - Apple Support
This link will show you how to update using your computer -
Update iOS on iPhone - Apple Support https://support.apple.com/guide/iphone/update-ios-iph3e504502/ios