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Failed upgrade install

After downloading the High Sierra upgrade to my iMac 21inch Retina display late 2015 operating Sierra 10.12

the installation froze. I tried rebooting the computer. The apple logo came on and the error message



Reset the PRAM and tell us if that works. Instructions are in Intel iMac SMC and VRAM resets



最後更新:2017-09-28 10:54:25

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