CBR-T Manual

I recently upgraded my service and I have this new CBR-T wireless router.  When first installed I did not have time to reset all my rules from my old router so I called support to get a manual on the modem.  They asked what I needed and they switched the modem to passthrough mode.

I now want to use the new modem as my router/wireless device and I cannot locate a manual for this device.  I would like to be able to put it in passthrough mode, take it out of that mode, etc.  I would like to manage the device.

All the help pages I've found reference the modem that was replaced.  Can anyone help me locate a manual for this device?