Well-known hacker Mathieu Hervais has reportedly found a bug that allows exploiting metldr, the bootloader and firmware version 3.56. Unfortunately, he refuses to release it.
Interestingly, it was recently rumored that Sony was soon going to be releasing new "unhackable" PS3 models to the market.
Quote:
Originally Posted by Mathieulh I hesitated a lot before tweeting about it, but a bug allows exploiting metldr, the bootloader and 3.56+. I don't intent to ever unveil it.