How to update iOS 12.4 on 6s
How can update my iPhone 6s with iOS 12.4
iPhone 6s, iOS 11
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Check iPhone type -> Go to: Settings -> General -> About.
If it is an iPhone 6 -> iOS 12.5.5 is the last security updates for iPhone 6, -> released 23 september 2021.
If it is an iPhone 6S you can update the iPhone to iOS 15, see this Apple article:
iPhone models compatible with iOS 15
iPhone models compatible with iOS 15.4 – Apple Support (UK)
Go to: Settings -> General -> Software Update.
See the following Apple articles:
Update your iPhone, iPad, or iPod touch
Update your iPhone, iPad, or iPod touch - Apple Support (IN)
If your iPhone, iPad or iPod touch won’t update
If your iPhone, iPad, or iPod touch won't update - Apple Support
You can do the update via PC, see this Apple article: Update software on iPhone, iPad or iPod touch in iTunes on PC
Update software on iPhone, iPad or iPod touch in iTunes on PC – Apple Support (UK)
If you have a Mac see this Apple article: Update your iPhone, iPad, or iPod touch with the Finder
Update your iPhone, iPad, or iPod touch with the Finder - Apple Support