Firmware Version 2.0.0 supports the use of the WFT-E2 / E2A wireless file transmitter with the EOS-1D Mark IV digital SLR camera. If you are using the WFT-E2 / E2A with the EOS-1D Mark III or EOS-1Ds Mark III, you do not need to update the firmware.
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.