I think the 6G iPod also has diagnostic mode. Hold both rewind and the select buttons at powering.
To do this I need uninstall rockbox and delete all music :'(
See first post for the info.
I guess the 6G iPod can't run Linux.
Even if it can run Linux I am not a programmer.
But I can donate some small amount of money to help. And already have donated.
I'll hope that the work will begin.
Rockbox is cool
