Downgrading your iPod Touch should not delete anything.
You probably ran out of memory space in your iPod. Delete a lot of apps to clear up space.
You cannot delete the legal information in the settings on your iPod Touch.
restore your ipod touch on itunes
It will delete music from iPod Touch, but the regular iPod i don't know about.
veiw it and press delete
delete it from your library in itunes
First, you need to connect the iPod to iTunes. Then, click on the Music library that is under the iPod Touch menu. That is your iPod Touch's music, and just right mouse click to delete them.
No.
unfortunatly there is no way to delete songs from the iPod touch itself to delete songs you need to do it through iTunes.
Yes, you can delete songs off of a jailbroken iPod Touch (but only through iTunes).
delete what you have, buy one with a larger capacity, or bring it to an apple store to be upgraded.