update my iphone

See this article.

Update your iPhone or iPad - Apple Support

Good Wi-Fi connection? (You cannot use hotspot to update)

Good cellular connection?

Fully charged battery?

Phone battery not on Low Power Mode?

Plenty of free space on the phone?

Opinions vary on how much free space is required for an update......some say 5 GB, others 8 GB or more. I can't tell how much free space the phone has.

When all else falls.....and it has for me, even though everything looked good.....I've still been able to update using a PC or Mac.

tharusha211 Said:

"update my iPhone: why i can't update my iphone to ios 12.5.7"

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Updating an iPhone 6 Past iOS 12:

A. You can't.  The iPhone 6 will only install to iOS12. See here: Update your iPhone or iPad Software if you're Experiencing Issues with Location, Date, and Time - Apple Support. And, for the note, even if you could update, only the latest version will install: iOS 16.

B. So, what to Try:

B. Update Using a Computer:

Have a Computer Handy? If so, try using a computer to update. Go here: Update your iPhone Using a Computer - User Tip. If any updates are availabe, they will install, sure enough.