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On
DS-2CD1023G0E-I model, there two different firmware, one with "C"; what does it stand for?
The (C) is a newer revision of camera or NVR model... there are (D) and (E) revisions now also... each revision has its own firmware...
This is a (C) model camera, but the "System Settings" page does not show the (C), so that doesn't help:
The "Firmware Version Property helps identify the correct firmware sometimes:
If you have the original box the camera came in, the model number there will have the revision letter, if there is one.