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
d11_m_5341_widebandshowcaseblast_c01.cm
or in your case d11_m_sb6121_widebandshowcaseblast_c01.cm i am guessing
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