My very own EnterRouterMode.sh based on the work of digidem and steve8x8. I will try to merge upstream changes, but focus on mobile file handling and usability.

• telnet login is possible after script run. Password for user root is 20080826. (Login is also possible with the admin user and password set from webinterface).
• password for the root user can be changed with ChangeRootPassword.sh.
• all changes to /etc/ have to be made permanent through execution of /usr/sbin/etc_tools p.
• the device has a "hidden" WebDAV service. It can be reached via http://10.10.10.254/data. Credentials are like in the webinterface.