Please note that if the firmware version of the WFT-E2/ E2A is Version 1.0.1 or earlier, the WFT-E2 / E2A cannot be used with the EOS-1D Mark IV and a firmware update message will appear on the camera’s LCD monitor.
Firmware Version 2.0.0 is for WFT-E2 / E2A units with firmware up to Version 1.0.1. If the WFT-E2 / E2A’s firmware is already Version 2.0.0, it is not necessary to update the firmware.
For details on the new functions that are available with the EOS-1D Mark IV, please download the PDF instruction manual from the bottom of this page.
Before downloading the firmware update, please be sure to read the entire contents of this page.
For full installation and information click here.
Files for Firmware Update