How can I update MacBook Pro 9,1 macOS Mountain Lion OS?
I bought a MacBookPro9,1 from a school sale. It Has Mountain Lion OS. How can I upgrade this
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MacBook Pro 13″, macOS 12.2
“MacBookPro9,1” is a Mid-2012 MacBook Pro i7-3615QM/3720QM/3820QM with 15" screen.
Its maximum version macOS is Catalina 10.15.7.
macOS Catalina technical specifications - Apple Support
How to update macOS on Mac - Apple Support
Use the Software Update option in System Preferences (or the Mac App Store).
You’ll need to update with an intermediate step, as updating from 10.8 to 10.15 in one go isn’t supported.