If you are connected via USB and receive this message, make sure the Wireless button on the back of the scanner is set to "OFF". By default, it is set to "ON" and you will receive this error message if trying to use the scanner via USB .
https://www.usa.canon.com/internet/portal/us/home/support/details/scanners/ document-scanner / imageformula - dr -c225w-ii/ imageformula - dr -c225w-ii-office- document-scanner ?subtab=downloads-firmware Once the firmware has been updated, you will need to download and install the latest versions of the following files: - TWAIN Driver
If you receive an unknown error while scanning, it may be that the scanner is having trouble communicating with the computer. Check to make sure that you are using the USB cable provided with the scanner. The following is a list of things that should be avoided: