From Canon USA:
Details:
Firmware Version 1.0.4 includes the following fixes:
Firmware Version 1.0.4 is for Wireless File Transmitters with firmware version 1.0.2. If the Wireless File Transmitter’s firmware is already version 1.0.4, it is not necessary to update the firmware. When updating your Wireless Transmitter’s firmware, please review the instructions thoroughly before you update the firmware.
Download:
The new Firmware Version 1.0.4 can be downloaded by clicking here.
This information is for residents of the United States and Puerto Rico only. If you do not reside in the USA or Puerto Rico, please contact the Canon Customer Support Center in your region.
B&H carries the Canon WFT-E7A Wireless File Transmitter.