Alloc8 Exploit

The alloc8 exploit is a bootrom exploit used to run unsigned code on the both the new bootrom and the old bootrom iPhone 3GS (and thereby jailbreak it). It is the first public untethered bootrom exploit for the new bootrom iPhone 3GS, and the last publicly disclosed bootrom exploit of all devices (as of this article's writing).

axi0mX published a detailed analysis of alloc8 at GitHub following his discovery of the exploit.

ipwndfu is currently the primary and most simple way of using the alloc8 exploit.