My question is : what best ios should I update? How can update if it were not the latest version?
iPhone XS Max, iOS 14
An Xs can run the current version of iOS 18.
When “jumping over” multiple iOS versions, it’s generally considered most reliable to use a cable and computer. (vice updating via WiFi)
Update software on your iPhone, iPad, or iPod touch - Apple Support
If needed:
If your iPhone or iPad won't update - Apple Support
iOS 18 is the only option available to you. Once Apple releases a new iOS version, they deactivate the downloading of any older version that your phone supported.
I 100% agree to use the "attach to computer" method to make such a big jump in iOS.
The best iOS you should and can update to is the latest iOS 18.3.1. It provides the latest bug fixes, features, and security updates. In fact, the latest updates patched 30 security vulnerabilities. The best way you should update is with a computer which you can jump update.
Update software on your iPhone, iPad, or iPod touch - Apple Support
I am using iphone XS max with iso version. 14.7.1.
