Got it, and installed it and it's up and running. Thanks so much! I suppose I should have thought about the sideloading idea, but I am new to the Shield as well, and don't use Android for anything else, hah.
Sorry, I don't mean to divert from the thread. I suppose this is more dedicated to issues with the firmware... So in good faith, I will pose a question related to such; is the new firmware on the shield keeping me from accessing my ROMs which are stored on my NAS? I seem to not be able to find the folder when importing to LB, even though my NAS is connected and accessible from the shield itself. Or is this an issue not related to the firmware and something I am doing?