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I too have firmware version 1.2.3 on my recently purchased 5D M3. I contacted Canon Australia and sent them a photo of the rear screen (as requested by them) clearly showing the firmware version installed. Their response was to return the camera to their technicians for investigation, which at this stage I am not keen to do. The 6th digit on the serial number is '0'(if that is at all relevant). All menu screens are identical as per the Canon manual for cameras with firmware version 1.2.0 or later (printed 2013). The camera has operated flawlessly so far. I have been looking for answers for weeks and this is the only other case I have seen. I am curious to say the least.