Identify your MacBook model - Apple Support
15″ MacBook Pro (Mid 2009) | Low End Mac
OS X El Capitan Compatible Macs and System Requirements: EveryMac.com
MacBook Pro 15" Unibody 2.53 GHz Mid 2009 - iFixit
Identify your Mac Pro model - Apple Support
Still using a 2009 MacBook Pro, should I upgrade to the new M2 macs? : r/ macbookpro
Unibody MacBook Pro Mac OS X and Windows Compatibility: EveryMac.com
MacBook Pro | Core 2 Duo 3.06 GHz | 15 Inch | Mid 2009 - Techable.com
MacBook Pro 13-Inch "Core 2 Duo" 2.26 (SD/FW) Specs (Mid-2009 13", MB990LL/A, MacBookPro5,5, A1278, 2326*): EveryMac.com
MacOS High Sierra Compatible Macs List | OSXDaily
Identify your MacBook Pro model - Apple Support (IN)
OS X EL Capitan Compatible Mac Hardware or Upgrade Requirements
Will Your Mac Run OS X Mountain Lion? The Mountain Lion Compatible Macs List | OSXDaily
MacBook 6,1 (13-Inch, Late 2009) - Full Information | iGotOffer
How to Install macOS Monterey on Unsupported Macs, for Security Improvements - The Mac Security Blog
MacBook Pro - Wikipedia
OK COMPUTER SOLUTION JB: MacBook Pro (15-inch, Mid 2009) and (15-inch, 2.53 GHz, Mid 2009) - Technical Specifications
MacBook Pro MB990LL A | Core 2 Duo 2.26 GHz | 13 Inch | Mid 2009 - Techable
MacBook (2006–2012) - Wikipedia
Identify your MacBook Pro model – Apple Support (UK)
Identify your MacBook model - Apple Support
macOS Big Sur system requirements: Which Macs support it?
What Version Of macOS Can My Mac run? | Macworld
