I have an IMAC 27" Late 2012 with macOS Sierra. What operating sysytem can I upgrade to?
My computer is really slow and it's not my connection. I think I need to upgrade my operating system maybe, but I'm not sure which one?
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A late-2012 through late-2013 iMac can be upgraded to Catalina 10.15.7 but not to Big Sur macOS 11. See: How to get old versions of macOS - Apple Support