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yosemite high sierra downgrade prohibit sign
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Downgrade High Sierra to Yosemite
Hi mac funs! I have macbook pro 15" 2015 with High Sierra (10.13). I decied to downgrade to Yosemite (10.10) due to one program which runs only on Yosemite. I did a USB with Yosemite by this tutorial: . But when I am starting the MBP I am holding a "Option" key and I choose my USB but then is...