Bios Mods -The Best BIOS Update and Modification Source

Hi,
I'm new on this forum and I want to use AHCI. But I have a little problem. My BIOS doesn't have AHCI. - LOL - . So can anyone patch my bios to have AHCI option ?
And if you can ( if you have time to waste ), can you add USB boot too ?
Thanks a lot,
Arno

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Sorry I've forgot the link:
http://www.dell.com/support/drivers/fr/f...nsion-8300#
https://mega.co.nz/#!5cIgCSBD!OIP2Pwl3VU...jzQZ8pjcQ0

I used to have one of those. It has the ICH5 which doesn't support AHCI. It supports USB booting already, though.
http://en.community.dell.com/support-for.../t/4050325

I also have the model that replaced it, the Dimension 8400, which has AHCI and lets you use it right away.