I have a UM2+ and have installed Cura 3.3.1. I then tried to upgrade the firmware on my printer, but even thought the software indicated a successful upgrade, it wasn't done. For instance, PP material appears in Cura...but not on my trusty old 2+. This was a Mac, using two different USB cables.
Then I went to my Windows box. There's nothing like a downgrade!! ( Please direct abuse to D. Trump...)
Again, upgraded the software, went through the firmware routine and still, no PP appears in my 2+ materials.
When I check the version on the UM2+, it comes up as Vers: 3.3.0 dated 15