You can update everything but the OS, to update the OS read the post #62, in the page 7~ in this thread, Its really easy, this is like a manual update, to install retail you have to follow this guide ;P

Good Luck ;D

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HP Pavilion Elite m9250f
iAtkos v5i (10.5.8), Asus IPIBL-LB MOD BIOS, Intel Quad Core Q6600, 4GB RAM (800mhz), 2x500GB, nVidia 8600GT (Works), ALC888S (Works), Wireless RT73 (Works), LAN (Works) - How to Install - Blog - Hardware Combos - FAQ by TJ2K7
Macbook Pro 13"
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