Software
How can i install iOS 15.6.1 software on iPhone 6s?
How can i install iOS 15.6.1 software on iPhone 6s?
Assuming you have a compatible device, see: Update your iPhone, iPad, or iPod touch - Apple Support
And: If your iPhone, iPad, or iPod touch won't update - Apple Support
If the above Apple articles do not help, please post back with relevant information.
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Check better: are you sure your iPhone is a 6s model? (not a 6, which cannot support iOS versions beyond 12.5.6)
What iOS version is currently running on your iPhone? check: Settings>General>About>Software Version.
Regards
Giulio
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My phone it’s iPhone 6 plus
CLIESFRAFOR ~ Apple offers many newer iPhone models which can run iOS 15:
iOS 15 and iPadOS 15 are compatible with these devices
...found by searching Apple's Knowledge Base.
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As posted by Giulio above, the iPhone 6/6 Plus can be updated to iOS 12.5.6, no further.
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