UnO stands for "UnOfficial" (= not created by Behringer). UnO firmware solves some annoying bugs and adds some frequently requested features.
To name just one: in "stompbox mode" you can use 1 row of FCB1010 switches to switch effects on/off, with the LEDs showing the current state at all time.
Initial stompbox states can be programmed for each preset.
UnO4Kemper firmware is a completely different beast. Instead of an allround programmable MIDI controller, the UnO4Kemper equipped FCB1010 becomes a plug-and-play remote control for the Kemper Profiler. Configuration is kept to a minimum, no programming required. 2-way communication assures that the FCB1010 LEDs are always in sync with the Profiler. Even the Profiler tuner can be shown on the FCB1010 display.
The One-Cable kit allows you to run 1 single MIDI cable from your FCB1010 to the rack behind you, carrying MIDI and phantom power. A small box at the rack side converts the single cable connection into regular power/MIDI IN/MIDI OUT connectors. Any 9V or 12V AC or DC power adapter can be connected at the rack side to replace the regular mains power input of the FCB1010.
Thousands of FCB1010 users installed UnO firmware, and just love it!
The most affordable solution for Profiler control. Just plug and play that guitar!
Run one single cable from rack to floorboard. Get rid of that cable mess!