how to add/ inject kexts, rebuild cache and fix permission from 10.8 to be able to install sierra/ high sierra

so im trying to add/ inject kexts, rebuild cache and fix permission to the high sierra installer but can seen to know how to do that, im trying to follow this process but still dont know how to do it or how to find the usb installer "path"

please any help will be appreciated

submitted by /u/aniel300
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