By the way, NiLuJe, I strongly suggest you ask mods to change the title of that HUGE thread to:
USBNetwork, Font & ScreenSaver Hacks for Kindles 2.x, 3.x & 4.x
which is just reordering of them. The reason is for newbies to this forum, they come to jailbreak their device... next word they learn is USBnetworking. See?
The previous title doesn't emphasize on how important and basic this thread is.