i`m not sure if it`s already known but want to mention it for everyone:
taken from the extracted firmware:
if [ "`ccfg_cli get AlwaysOn@ssh`" == "off" ] ; then
# dropbear => If sesame.txt exists in the first partition of USB storage, router can start dropbear daemon.
so placing a 0-byte file "sesame.txt" on an usb stick, putting it into the easybox starts dropbear instantly - with SSH.
Unfortunately, dropboard seems not to allow password based login, only key-login. so somehow we have to prove dropbear with our public key to be able to login..
Looking forward to what you do with it