iPhone 6 how to upgrade to iOS 15.6.1
iPhone 6 plus
how to upgrade to iOS 15.6.1
Windows, Windows 6
Question marked as
You can't. Your phone is too old, too underpowered and lacks the hardware required to update beyond iOS 12.5.5.
Time for a newer, more modern iPhone.
You may see longer more detailed replies, but this is the short, simple answer you need to know.
