How can i update my new software version
How to check for latest updates
iPhone 6s, iOS 14
An IPhone 6S can only update to iOS 15.7.5, not 16.X
Go to Settings > General > Software Update.
This link will show you how to update your iPhone, iPad, or iPod touch using WiFi -
Update your iPhone or iPad - Apple Support Update your iPhone or iPad - Apple Support
This link will show you how to update using your computer -
Update iOS on iPhone - Apple Support Update iOS on iPhone - Apple Support