I downloaded it directly from that speific model... Also the non-wifi anfd wifi version has THE SAME BIOS... you may check the Asus site to verify...
The wifi and non-wifi versions of the P5B deluxe share the same bios! There is absolutely no difference. So you can use either.
There is no ASUS SLIC v2.1 and no one knows if there will be one or when it will be available....DELL SLIC v2.1 is just as good.
I was using 2.2.1.3., I just haven't modded Phoenix BIOSes before, AWARD and AMI are a lot easier to mod because of the automatic pathing tools