10.8.2 reinstall

cool11 said:

I have already installed it. But I 've made a change to mach_kernel file (make it invisible) and I am wondering if there is any way to reinstall it.
How can I do it?

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start your mac from recovery format your drive download and install mountain lion 10.8 migrate your settings,files and applications from your time machine and update to 10.8.2.