It is confusing the first time. I just formatted usb and took me awhile to realize kemper recognized it but there's no popup. There is little icon at top of led screen referencing it. You have to click through few popups to format. It's not obvious.
Once formatting usb I followed the same procedure explained by gregsimon above (also in pdf in update folder) seemed to work fine so far.
Thought there was way to do this through rig manager? I didn't see way to do this. 'Check for Software Updates' wouldn't even recognize new version of Rig Manager on my computer. I'm on iMac.