Seems like I can't even get it to revert to Dingo from the USB. I took out the microSD card, put the update.zip file (with that exact name, and in the root part of the drive) on a 2GB USB drive and put it in the USB port, hit the reset button to make sure it was powered off, held down the menu and rotate buttons for 10-12 seconds after pressing the power button and then released them.

Basically, it seems to boot up fine- the ereader initializes fine and I even hear the sound I set for notifications everytime I receive an email. To me, that means that Android is loading up, connecting to the WLAN network, and receiving emails. It's just that darn screen!