Got it!! Either by luck or tired fingers it seems some used the procedure sucessfully. I further researched this and found what step was missing.
From another post I found, this one worked. The missing step was the "twice" not just once in step 4.
I've read a dozen different ways to do this and this one worked PERFECT for me today. Here's what I did.
1. Put the key in the ignition and switch it on without starting the engine.
2. The ASSYST mileage will show, when the mileage shown returns to the vehicle mileage, IMPORTANT the mileage of the vehicle needs to return THEN and ONLY then hit the O button.....hold the O button down till you hear a beep (could take a while) and you will hear one soft little beep – then move on to the M button.
3. As soon as you hear the beep, press the M button once to see the menu, then repeatedly and a number of reset menus will appear. Select "reset 51" (don't know what the other reset menus are for)
4. At reset 51 press the O button until a number 2 appears, release the O button, then press it TWICE, and the LCD should show "display reset done" or just "done".
This worked for me. Previously, just once, didn't do the trick. Hope this helps.