How to my iPhone 6s Plus software update
my iphone don’t software update please my iPhone software update
iPhone 6s Plus, iOS 13
What iOS version is it now running? An iPhone 6s Plus can run up to iOS 15 but no higher.
If you are not at iOS15.X, try Settings > General > Software Updates. If that does not offer an update and you are not running the latest iOS15 version, then:
Update your iPhone, iPad, or iPod touch with the Finder - Apple Support
Update your iPhone, iPad, or iPod touch with iTunes - Apple Support