OS X UPDATE ON MAC BOOK PRO

You can upgrade as high as El Capitan OS 10.11.6, but no higher. You can get El Capitan using this link:

How to upgrade to OS X El Capitan - Apple Support

The download link is near the bottom of the page.

Hello,

The reason is because the hardware in your Mid-2009 MacBook Pro is no longer compatible with a macOS that is newer than 10.10.5. If you were able to update, for example, then your machine would have had extreAxmely low to perhaps no performance while attempting to perform even some of the most basic tasks. Your entire experience around your MacBook Pro would be very poor and unsatisfactory.

Axel F.

There is little you can do and that is update up to El Capitan macOS 10.11.x and that is it.

Beyond that, there is nothing that you can or should do as far as updating the macOS is concerned.

Axel F.