Ok iPod Photo to the rescue!!!
The iPod photo has a nasty restore process that requires the iPod to be plugged into an external power supply when preforming a restore. I know for a fact that the iPod Photo comes with an AC adapter. All you need to do is plug your iPod's USB cable into the adapter, plug the iPod onto the other end of the cord, and finally plug the adapter into a wall socket.

Don't think i can give more detail
In the case that you don't have an AC adapter then your iPod is the closest possible thing to bricked that you can achieve with rockbox. *claps*. No worries there are many 3rd party adapters on the market or you can buy and official apple AC adapter.