How to update iphone on a different computer

I am trying to update my girlfriends iPhone on my iTunes on ym mac. How do I do this without he rlosing any of her stuff. I simply want to perform a software update only.

Iphone will sync with one and only one cpomptuer at a time.  Syncing to another will erase the current content and replace with content from the new computer.  This is the design of the  iphone.
It will erase the content when you sync.
Why not update from the comptuer with which you normally sync?

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