How can I safely sync to iTunes on a friend's computer and restore my phone without erasing all his stuff on his iTunes/iPhone?

I need to sync to iTunes in order for Apple to recognize my newly unlocked iPhone 4.  I can't do it on my computer (not up to date, not enought time to upgrade OS), so need to do it on another MacBook.
So how do I do that without messing up my friend's iTunes and iPhone content?
Thanks!

You don't need to sync it, you need to restore it.
Back it up to iCloud. Have your friend create a new user account for you on their Mac. Log into the Mac with that user account. Plug in the phone. Restore the phone using iTunes (this will upgrade it to the current version). Restore the phone from your iCloud backup during the setup process.

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