Unlock means use it with different carriers; jailbreak means you can install stuff on it. So you can't unlock an iPod Touch at all, but you can jailbreak it.
This version broke youtube on my phone and it also couldnt download anything through installer, it worked in the previous version with the full method (-u, -a, -j), but now that doesnt seem to fix it. This guy seems very reluctant to realize he has bugs with his software to.
i jailbroke my 1.1.4 ipod touch. If you get the BSD root error while doing it.
Hold down home on your ipod, plug it into the computer while holding home. It should restore. Run Ziiphone, should work, thats all i did with my 16gb.
Just so you all know, it's not recommended to downgrade 4.6 BL to 3.9. Reason being, once you downgrade, you're stuck there forever. There's really no reason to do so right now anyway. The only feature you'll be missing by not downgrading to 3.9 is the "Locate Me" thing on Google Maps. That's the ONLY reason to downgrade.