Guide on how to install Rockbox on an 6g iPod Classic using the new bootloader and Rockbox utility program.
HowTo: Install Rockbox on the iPod Classics
Easy to follow tutorial on how to ditch the Apple OS and replace with EmCore / Rockbox on the later 6g / 7g iPod Classics.
Added side effect is that this also bypasses the 6g 128Gb Limit.