How to Install macOS Catalina on an Unsupported Mac - MacRumors
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The Mac Pro Review (Late 2013)
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Big Sur Patcher Working on Mac Pro Early 2009 : r/BigSurPatcher
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How to Upgrade the Firmware of a 2009 Mac Pro 4,1 - iFixit Repair Guide
PSA: macOS Sierra drops support for many Macs from 2007, 2008, and 2009 | Ars Technica
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macos - Mac Pro 4,1 (Early 2009) Sierra Compatibility? - Ask Different
Mac Pro 2009-2012 Repair (2009, 2010, 2011, 2012) - iFixit
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Mac Pro | Apple Wiki | Fandom
Mac Pro - Wikipedia
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Apple Mac Pro (Mid 2010) Review
Mac Pro (Early 2009) - Technical Specifications
macOS compatibility: What OS can my Mac run? | Macworld
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