1. Copy the (new) kext files to /System/Library/Extensions

2. Open the Terminal & type the following Commands (hit enter after each line):

sudo -s (-> your root password)

sudo chown -R root:wheel /System/Library/Extensions/[NAME].kext

sudo chmod -R 755 /System/Library/Extensions/[NAME].kext

rm -r /System/Library/Extensions/Caches

reboot

Now use -f at boot to force the rebuilding of kext files.

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CPU: Phenom x3 8650 @2.54 ghz
Mobo: ASUS M3N HT-Deluxe 780i SLI
3 GB 800 OCZ RAM
Lawless 10.5.4 w/ Voodoo Kernel