3.21 was the update that killed Linux. 3.42 is what killed the JailBreak (for now, though probably forever), and the JailBreak has absolutely nothing to do with Linux. You just flash a certain type of USB board (there are many versions that work, you can install it on an iPhone, Android phones, an Xbox 360 USB SPI flasher, and now, even the PS3 DualShock controller will be able to do it), turn off the system (or unplug if it's a slim), plug in the USB board you're using, turn on the power switch (or plug it in), then hit power then eject quickly, and you're in. The JailBreak itself doesn't make any permanent changes to the system. I have SNES9X installed on my PS3, it's amazing how quickly it came out, though SNES360 is much better for now. Another cool thing you can do is edit PARAM.SFO on just about any PS3 game (has to be installed to the HDD though), and you can allow remote play on *any* game. Getting off subject though...