Mid 2012 MacBook Pro most recent MacOS compatibility
Will Big Sur 11 MacOS or later run on a mid 2012 MacBook Pro?
MacBook Pro
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Sorry, no. Catalina is the highest possible. See the filling from Identify your MacBook Pro model - Apple Support
MacBook Pro (15-inch, Mid 2012)
Model Identifier: MacBookPro9,1
Part Numbers: MD103xx/A, MD104xx/A
Newest compatible operating system: macOS Catalina 10.15.7
MacBook Pro (13-inch, Mid 2012)
Model Identifier: MacBookPro9,2
Part Numbers: MD101xx/A, MD102xx/A
Newest compatible operating system: macOS Catalina 10.15.7