IMAC upgrade
how do i upgrade from El Capitan 10.11 to at least 10.13
Imac will not support big sur
iMac 21.5″, OS X 10.11
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Your iMac must be a Late 2009 or newer to run High Sierra. This shows how to find your year model, from "About this Mac..." on an iMac running El Capitan:
IMAC upgrade