See the OpeninkPot Wiki on the Story HD. It explains how to run commands on the device.
you can then start telnetd with telnetd -p SOMEPORT -l /bin/sh
then reboot, connect to wifi, then from any client telnet ip_of_the_reader (you have to figure that out) and you'll be on a root shell. it wont ask you for a password though so it is anything but secure - something to keep in mind when using public wifi