can you put a wrench on the spools sticking up and rotate each one a bit? Do not put channel locks or pliers on those spools. Use the wrench flats that are there. Could be one of those spools has a bit of dirt stuck in it.
Tom, here is a site selling that emulator for $99. https://www.canbusemulator.com/dpf-emulatorleri/kubota-dpf-emulatoru
I would be sure your dpf is clean, buy a new emulator and see if that doesn't get you running.