iphone 7 cannot update 15.4??
iphone 7 plus cannot update latest software??
iPhone 7 Plus, iOS 14
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You can update your iPhone to iOS 15, see this Apple article: iPhone models compatible with iOS 15
iPhone models compatible with iOS 15.4 – Apple Support (UK)
What happens if you 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
You need good Service & Wi-Fi connection.
If they are On, turn Off Hotspot & VPN.