You don't need to do that from the recovery menu, I'm not sure why it says that because it didn't work for me. Assuming you know how to use adb since your rooted and OC'd, just copy the tiwlan_drv.ko file to the root of your SD card, unmount the SD card from your computer, and open up command prompt. This is what you need to type.
adb shell
su
mount -o remount /dev/block/mtdblock4 /system
mount -o remount,rw /system
cp /sytem/lib/modules/tiwlan_drv.ko tiwlan_drv.ko.bak
cat /sdcard/tiwlan_drv.ko > /system/lib/modules/tiwlan_drv.ko
chmod 644 /system/lib/modules/tiwlan_drv.ko
mount -o remount,ro /system
mount -o ro,remount /dev/block/mtdblock4 /system
sync
reboot
After your phone reboots your wifi should be working perfectly.
