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I have such a problem. I had a os x Yosemite on my laptop but I wanted to update it to macros Sierra, but there was a problem. I created an installation usb and it worked fine, plugged into the notebook and let it load. When it loaded, I tried to format the disk to mac os extended journalnaled...

Hello, i have a problem, when I wanted to boot Macos Sierra on my laptop it was frozen. I tried different flags but it did not work. I had an os x Mavericks on my laptop but I wanted to upgrade to Sierra but it did not work anymore. I do not know what to do about it. Please help. My laptop...