"control chain device update"?

I connected my MODDuo today and a box with the message CONTROL CHAIN DEVICE UPDATE popped up.

Step 3 - “While the first footswitch is down, connect the device to the MOD Duo via USB”

There is no USB port on my footswitch extender.

What am I missing? Besides a USB port on my footswitch extender, that is…

Oops… Please disregard. I should do I search before I post. What can I say, it’s early and I’m undercaffeinated…