How to get root through TR069 and read access.

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http://www.linuxquestions.org – Hi, I have an ADSL modem and router, its OS is linux. It runs ftp service, and I can read files in its file system, but I have no permission to list files and to write files. It has TR069 protocol connections and can upgrade remotely.It has ssh, but not started. How can I get root access permission? Thanks. (HowTos)