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failed update on mac os x

ok'd the update on my apple mac os x and it failed. it says something about missing thread records when i try to run it. did recovery mode and try to restore it also, i cant do anything with it, if i could just get back to what i had before the update i'd still have a working computer. this is my first mac

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Which Mac and what operating system, what update, how did you try to install it?Recovery mode from what?

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If you get booted successfully to Mac OS X Utilities using Command + R then you have the chances to restore your Mac either to your last OS or Time backup. Otherwise, get a working bootable USB and re-install macOS afresh. Later, restore your data from Time Machine.

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Sheila Reynolds 将永远感激不已
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