HT1338 May I know how to downgrade my OS 10.80 to 10.70?

after upgraded from 10.7 to10.80, my wired internet cannot work, i do not know why, so i really want to down grade it but i cannot do that, why and how?

Have you tested you wired internet with another Mac or PC to see if it works there? You may also wish to try another Ethernet cable incase there is an issue with the one you are currently using.
If you are sure you want to downgrade then I believe you need to boot to the Internet Recovery to reinstall Lion. This is the way I had done it soon after the release and I haven't heard anything about this procedure changing.
Turn off the Mac and reboot holding Command, Option and R. Internet recovery will begin and eventually bring you to a screen where you should be able to reinstall Lion.

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