Cube-Black version

I was trying to download an Arducopter firmware to my cube,
and I saw that there are 2 options of firmware: cube black and cube black +
does anyone know what’s the difference between the two?
I tried looking it up in the forum but couldn’t find anything.
Thanks in advance!

Choose the Cube Black.

The Plus has the same sensors as the Orange and Yellow but the Black FMU board. the original sensors are in short supply now. It’s not a retail model and was supplied for some specific use cases I believe.