How to Upgrade a 15-inch MacBook Pro (Mid 2009) Hard Drive/SSD - YouTube
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com
Replace your 2009-2012 MacBook Pro HD with an SSD
Does the mid-2012 13 MacBook Pro have an M.2 slot that I can use for an Intel Optane memory upgrade? - Quora
Mid-2009 Apple MacBook Pro 13" - 120GB SSD / 4GB RAM - 2.53GHz Core2Duo Laptop 885909296545 | eBay
2009 Macbook Pro CPU upgrade? | MacRumors Forums
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How to Upgrade MacBook Pro Hard Drive (Unibody, 2009-2012): EveryMac.com
13-inch MacBook Pro Mid 2009 Hard Drive/SSD Installation Video - YouTube