Perl Patch for Mountain Lion DP2-DP4 (AppleRTC.kext) in Terminal:
Since Mountain Lion DP2 AppleRTC is only a 64bit binary. The patch for AppleRTC.kext Mountain Lion GM ( same as DP2-DP4) is:
sudo perl -pi -e 's|\x75\x30\x89\xd8|\xEB\x30\x89\xd8|' /System/Library/Extensions/AppleRTC.kext/Contents/MacOS/AppleRTC
To be sure that you dont use the old Kext from your caches its recommended to delete the caches in terminal and do an immediate reboot (dont give kextd time to rebuild caches).
sudo rm -rf /System/Library/Caches/com.apple.kext.caches/*
or better use it in /Extra/Extensions and install myhack.kext and run myfix script