I'm using a 15" mid 2014 macbook pro retina which runs OS X Yosemite. I ran opencore before on it to upgrade to Sequoia... then upgraded the version of Sequoia where everything started lagging ridiculously as far as functions like minimizing windows/disappearing arrow cursor, etc... So, I decided to do a full factory reset to reinstall opencore and get the older version of Sequoia so it could run smooth... now it says I need High Sierra after downloading and validating the installer.... WTF? somebody please help!
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