NO NEW UNLOCKS HERE! FOR USERS WITH BB VERSIONS CURRENTLY SUPPORTED BY ultrasn0w ONLY! PLEASE RTFM!
4.3 seems to have enabled slidable image address randomization (ASLR). This broke ultrasn0w code naively using 0x1000 as the main executable base address. In addition to that, its FindReference function was using hardcoded offset/xref pairs for slidable images, which means every fw update will break it.
So, I've written a small dylib that works around those issues.
Only tested on 3GS; will require changes for next betas.