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I'm trying to downgrade Catalina Beta 5 to Mojave. I formated disk, made bootable usb, but every time when I'm trying to load os from usb, macbook connecting to iternet, doing somthing (I don't know what, but it takes from 20 min to 2 hours) and getting an error "-1008F". I tried shift+opt+cmd+r, opt+r and and still the same error.