Upgrading the new MacBook Pro is still a major pain
Replace your 2009-2012 MacBook Pro HD with an SSD
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Photo tutorial: Upgrading a MacBook Pro with an SSD
How to install an SSD on a 15-inch Retina MacBook Pro
SSD upgrade on MacBook Pro 2014
MacBook Pro 13 A1502 How to install M2 SSD upgrade - YouTube
512GB SSUBX SSD Apple MacBook Pro Retina 13" A1502 Early 2015, 15 A1398 Mid 2015 | eBay
The next-gen MacBook Pro with Retina Display: SSD Analysis
How To: Replace the SSD in your MacBook Pro retina 13" Early 2015 #SSD #upgrade #replace - YouTube