M1 Mac RAM and storage can be upgraded after purchase, but it's not easy - 9to5Mac
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MacBook Pro RAM Upgrade - 8GB
Apple MacBook Pro 2011 (Early) (Late) 13-inch 15-inch 17-inch MacBookPro8,1 MacBookPro8,2 MacBookPro8,3 SSD RAM OSX UPGRADE - ZD Laptop Service Centre
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16GB MacBook Pro RAM Upgrade (2011/2012/2013) - YouTube
Memory/ RAM Upgrades For Apple MacBook Pro 2011 from OWC
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Upgrade MacBook Pro 8,1 to macOS Catalina with 16 GB of RAM – Jaehoo Weblog
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Memory/ RAM Upgrades For Apple MacBook Pro 2011 from OWC
MacBook Pro: How to remove or install memory - Apple Support
