iPhone 12 my MacBook doesn't not recognize my iPhone
my older MacBook Pro does not recognize my Ihone 12
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Did you go through the steps in the related article from which you posted your question?
If your computer doesn't recognize your iPhone, iPad, or iPod - Apple Support
How old is your older MacBook? I have a ten year old MacBook Pro running 10.11.6 and I can backup and sync all of my iOS devices running iOS 14.6.