How to Install macOS High Sierra on an Unsupported Mac - YouTube
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Apple macOS Sierra: how about that compatibility list? (2023)
MacBook Pro 2009 Upgrade Series PT.1 High Sierra Install - YouTube
Macs Able to Run macOS Sierra Remain Compatible With High Sierra - MacRumors
Identify your MacBook Pro model - Apple Support
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Apple MacBook 13-inch Late 2009 2.26GHz Intel Core 2 Duo (MC207LL/A) – UNICOM, Inc.
250GB SSD For Apple Macbook Pro 2009 2010 2011 2012 El Capitan High Sierra | eBay
Preparing a 2009 MacBook for macOS Sierra - YouTube
It's old as heck but still kicking! Mid 2009 MacBook Pro (MacBook Pro 5,5) I'm hoping to use opencore legacy patcher to install Monterey on it. : r/ macbookpro