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Model A1297 Unibody: Early 2009, Mid 2009, Mid 2010, Early 2011 & Late 2011

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up grade my 17" a1297 to Catalina

How can I upgrade my 17" A1297 2.5 to Catalina?

I have another laptop that is running Catalina that works well enough for me.

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Sadly it’s just not possible. This series of Mac’s used a 16bit CPU (CoreDuo) Catalina requires a true 32bit CPU (i5, i7 or i9)

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How is it possible that the laptop I am using right now is running with Catalina?

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@xmaslovechild - Which model? The root issue is how the shim service integrates with you given systems firmware calls. This is we’re we often talk about a 32Bit clean EFI, this system is strictly 16Bit.

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Dan crwdns2934231:0crwdne2934231:0
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