Ahm ... this might sound stupid now but the file i extract from the zip-package, is it really a .kext file? I only see IONetworking without a extension. I did the following steps:

- Extract the file from the .zip-Folder
- Renamed it to IONetworkingFamily.kext
- Deleted the original File from /System/Library/Extensions
- Copied the new, renamed file into the Extensions folder
- Did the sudo stuff
- Restarted and my internet were gone. A error message popped up that the .kext could not be loaded
- Copied the backup of the original kext back to the Extensions folder, did the sudo stuff, restarted and my internet is back

I am sure i did something wrong, maybe the renaming of the file. One thing i've noticed is that if i rename the file, i can't get "inside". With other kexts it is possible.

So what did i do wrong? Sorry ... noob alarm ^