New firmware updates are available for the Canon EOS 50D, 450D and 1000D digital SLR cameras. The latest firmware, Version 1.0.6 for the 50D, Version 1.1.0 for the Rebel XSi or 450D and Version 1.0.5 for the 1000D support the AF assist beam feature of the Speedlight 270 EX, the newest flashgun from Canon.
Also, in the case of the 50D, the latest firmware corrects other issues such as vertical banding noise. Canon also advises EOS 50D users to update their Digital Photo Professional, Picture Style Editor, ZoomBrowser EX and ImageBrowser software to the latest versions.
Canon EOS 450D Firmware v1.1.0
Canon EOS 1000D Firmware v1.0.5