How to Upgrade the Main Drive in a 27 inch iMac 2012 2019

Apple imac 27 5k retina 2015 core i7 6-gen 4gz 32gb ram 1tb ssd 2tb hdd a grade the seller is techluxurious and is located in boston. Don't want to miss out on all the latest news, competitions & offers? May Have Few Light Signs of Used Non Noticiable Marks on the Back Casing. This Product is in Pristine.