USB/CAN Mode Switch
If your Eddy is the Duo version, make sure the USB/CAN toggle on the back of the Eddy is set to USB (the older USB-only Eddy doesn’t have this switch)
RP Boot Mode
To put the Eddy into boot mode, hold the BOOT button while plugging in the USB cable (either directly to your Pi or into a USB toolhead that has extra USB-Out ports)
The BOOT button is located on the top of the Eddy.