Upgrade Problem


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Jan 22, 2023
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Hello!

So i updated my Macbook Pro Mid 2014, Retina from Mountain Lion to Big Sur. Unfortunately i began to have problems with Ableton live (music production program), therefore i wanted to downgrade it again. I created a bootable USB Stick first with Mountain Lion, then with Catalina but both failed. I was able to choose the USB with the OS to boot from but after a bit of loading screen a Stop-Sign came :(


Does anybody know what i can try to fix this problem? Thank you so much for your help!
 
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