Firmware specification changes
This firmware update (version 1.1.0) incorporates the following additions and improvements:
Three new languages (Russian, Korean, and Traditional Chinese) have been added to the camera menus.
The phenomenon of horizontal line noise appearing in images taken at high ISO settings while using the internal flash has been fixed.
This firmware update applies to cameras with firmware versions up to 1.0.5 installed. If your camera's firmware is already version 1.1.0, it is not necessary to perform this update.
Click here to visit the Canon EOS 20D Firmware Download Page