Introduction

Canon has today posted firmware for two of its digital SLRs, the EOS-1D Mark II and the EOS-1Ds Mark II. Both the updates add Russian, Traditional Chinese and Korean languages to the menu systems, plus an improvement in communication reliability when using some CF cards. Firmware version 1.2.1 for the EOS-1D Mark II also addresses the issue of communication failure between the camera and some personal computers.
Canon EOS-1D Mark II firmware update version 1.2.1
What has been changed in version 1.2.1 of the firmware?
This firmware update (version 1.2.1) includes the following additional functions and improvements:
1. Three new languages (Russian, Traditional Chinese, and Korean) added to the camera menus.
2. Improvement in communication reliability when using some CF cards.
3. The issue of communication failure between the camera and some personal computers has been fixed.
This firmware update applies to cameras with firmware version up to 1.1.0 installed. If your camera's firmware is already version 1.2.1, it is not necessary to perform this update.
Canon EOS-1Ds Mark II firmware update version 1.1.1
What has been changed in version 1.1.1 of the firmware?
This firmware update (version 1.1.1) includes the following additional functions and improvements:
1. Three new languages (Russian, Traditional Chinese, and Korean) added to the camera menus.
2. Improvement in communication reliability when using some CF cards.
This firmware update applies to cameras with firmware version up to 1.0.3 installed. If your camera's firmware is already version 1.1.1, it is not necessary to perform this update.