[giorgio130]

Well, at least I've solved this one: in /etc/init.d/on-animator.sh it uses

while true; do
        i=$((((i + 1)) % 11));
        zcat /etc/images/$PREFIX\on-$i.raw.gz | /usr/local/Kobo/pickel showpic 1;
        usleep 250000;
done

so pickel is the key