We have a m3550idn that will not update the firmware, we keep getting, OPT error 0301. This firmware works well on the 3540idn, but errors on the 3550idn. There is nothing added to the 350idn as far as security kits or any other options, it's just a basic machine, not connected to the network either. I believe these machines take the same firmware if I am correct.
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