If you are wondering how to update your old MacBook Pro and are running into issues updating then you most likely need to update to 10.11 El Capitan first. If you are running an older OS, macOS 10.10 or lower, you will need to upgrade your computer to 10.11 El Capitan first, before using the steps above to upgrade to a supported version of macOS. If your computer does not meet the minimum requirements for Catalina/Big Sur then try upgrading to macOS 10.14 Mojave instead.
To see if your computer can run macOS 11 Big Sur - check Apple’s compatibility information and installation instructions. If you are running macOS 10.11 or newer, you should be able to upgrade to at least macOS 10.15 Catalina. How to update from an old version of MacOS | Outdated macOS and how to upgrade
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