If you own a EOS 7D Mark II, Canon has just released version 1.1.1 of their firmware. Here is the change log that Canon has published: Enhances reliability of communications when transferring images using Wireless File Transmitter WFT-E7A. Corrects the phenomenon of Err70 which occurs with certain combinations of settings. Corrects the very rare phenomenon in which the shutter can no longer be released. Enhances reliability of operations for specific custom function settings. To download the new firmware, click here