Changes in this version:
Firmware version 1.2.3 incorporates the following fixes.
Fixes a phenomenon in which the settings of the Speedlite transmitter ST-E2 revert to the default settings when both the camera and the ST-E2 are set to auto power off.
Fixes a phenomenon in which the Macro Ring Lite (MR-14EX, MT-24EX) and slave flash do not sync while shooting wirelessly.
Firmware version 1.2.3 is for cameras with firmware up to version 1.2.2. If the camera's firmware is already version 1.2.3, it is not necessary to update the firmware.
Please note:
Cameras with the version 1.2.3 firmware (and also versions 1.2.0 through 1.2.2) cannot be downgraded to a previous firmware version (such as version 1.1.0 or earlier).
Further information and download. 
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