i try with that kext and when mac start up, it pop up a message that kext cant be instaled, btw i try with another resolution with kext from previous post, and it's same.
what can it be?
The permissions on your kext are wrong. To fix this:
Go into disk utility (/Applications/Disk Utility), select your boot volume and click on "repair permissions" on the first aid tab. This should fix your problem.