I get the Unknown error very often. The first time it happened to me I was going from 1.1.2 to 1.1.1. Unknown error. Tried again, wallah. I got it to 1.1.1 and Jailbroke it! Looked at all the apps, was quite excited! Then I installed the oktoPrep as per this guide, http://forums.ilounge.com/showthread.php?t=212346, and then went ahead to update to 1.1.2. Unknown error, tried everything again. Unknown error again. Now I'm trying again, let's see if it works.... If it doesn't work this time, I guess I'm stuck on 1.1.1. Also - I've tried the 1.1.2 file from Apple and [PIRACY.mu]. Both seem to make no difference. Son of a b*tch - it happened again. Unknown Error 1602 during "Preparing your ipod for update". Ideas?