As most of you are probably aware, there is a slight defect with European and French iPod maximum volumes. (You could also say a cap or limit.)
Fixing however is simple:
The following instructions apply to 3G, 4G, mini, color iPods.
Copy the iPod firmware to your disk:
dd if=/dev/sda of=ipod_fw count=1536
Apply some magic:
perl -Mbytes -p -i -e's"(?<=\x08\x00\x9F\xE5\x38\x01\x90\xE5)(.)(.)"$2$1"s' ipod_fw
Send it back to the iPod:
dd if=ipod_fw of=/dev/sda
Gracefully have it reload the firmware:
To undo, just repeat once more.
(You have to send your regards to nusse for this, he made me write it down.)