could try resetting the modem(factory reset)
i think it will show you the config then when it boots up in the log
can't be sure, I don't own a sb6121
but I am pretty sure you are getting the right config since your upload is so high.
Also your config file should look something like this
or in your case d11_m_sb6121_widebandshowcaseblast_c01.cm i am guessing