Voici une traduction plus propre :
We took the PSJailbreak out of retirment to take a closer look. We now explain you in short how the PSJailbreak works internaly.
We can confirm that PSJailbreak is not a clone of Sonys "Jig" module. PSJailbreak is a honestly developed exploit. The chip is no PIC18F444 but a ATMega with Software USB. That means, the chip can emulate USB. PSJailbreak mainly emulates a 6Port USB Hub, where certain USB Devices are connected and disconnected in a specific order. One of these devices oses an ID of Sonys "Jig" module, which means that the "jig" module must has played some role in this developement.
But lets start up front: When turning on your PS3, the USB emulation connects a Device, which has a way too large configuration descriptor that overwrites the stack with a PowerPC Code which gets executed! Now different USB devices get connected in the USB emulation. One device has a descriptor with the size of 0xAD, which is part of the exploit and holds static data. Short time later ( we talk in milliseconds ) the Jig module get connected and encrypted data is send to the Jig module. A ( few milliseconds ) eternity later the jig module answers with 64 Byte static data, all USB Devices get disconnected, a new USB Device gets connected and the PS3 starts in new dress.
[screenshot]
64Byte static data that gets send by the emulated jig on the PS3.
[screenshot2]
Part of the USB stream
By the way PSJailbreak is not updateable! The promised "update-feature" could, if possible only be done with additional hardware!