Motorola actually has there phones on sale. Just bought the Motorola Think Phone for 399. usd. Compatible with V, ATT, Tm. And Red Pocket offers an all and everything plan for 30 a month. So save yourself some dough.
Now back to tractors...
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.