Firmware version 1.2.3 for the EOS 7D incorporates the following fixes. 1. 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. 2. Fixes a phenomenon in which the Macro Ring Lites (MR-14EX, MT24-EX) and slave flashes do not sync while shooting wirelessly. Firmware version 1.0.9 for the EOS 550D incorporates the following fix. 1. Fixes a phenomenon in which tone jumps become noticeable in some images, depending on the shooting scene, when shooting with the Auto Lighting Optimizer settings (Low / Standard / Strong). Firmware upgrades can be installed by the user. Full instructions and downloads are available at the >> Canon Download Centre
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