Boot while pressing volume down, telnet to the device and one of the options should allow you to wipe it clean/reset to factory settings
[CLEANUP] Starting cleanup! [CLEANUP] Umounting top volume... [CLEANUP] Deleting /mnt [CLEANUP] Cleanup done. Mounting /dev/mmcblk0p28 on /mnt sh: unlock: unknown operand Type your devicelock code and press [ENTER] key: (please note that the typed numbers won't be shown for security reasons)