Firmware version 1.1.0 is available for the EOS 5DS and 5DS R cameras and adds the following enhancement:
1. Support for the Wi-Fi Adapter W-E1 has been added.
When downloading the firmware update, you should ensure that you are downloading the correct update for your model, as the firmware for the two models is different.
Download EOS 5DS firmware v1.1.0 from Canon
Download EOS 5DS R firmware v1.1.0 from Canon