UPDATE: Success! 10.8.4 on HP Probook 6460b
UPDATE 09.aug.2013
FRESH INSTALL 10.8.4:
Just installed 10.8.4, as a fresh install, on my wife`s Probook 6460b, using Probook installer 6.1.1 and 2 kexts from MultiBeast.
Do this:
1. Install 10.8.4 as usual with Unibeast, restart. Boot...