There has been multiple reports of the FP tune and your Stock tune getting erased when you update. It happened to me and had to have a FP tech call me to get me up and running again. I just saw today that there is again another update!
Here is my recommendation to avoid getting your tunes wiped out. Before you update, do this first:
1. Plug your Procal 4 to your Bronco and return to stock tune.
2. Plug your Procal 4 to your laptop and it will ask if you want to update. Press OK and let it update. After the update, you will note you have lost your FP tune and Stock tune bin.
3. Plug back your Procal 4 to the Bronco. Now it will ask you if you want to save your Stock file and press yes. After that is done you will notice that there is still no FP tune to load.
4. Plug back Procal 4 to your laptop. This time you will see your FP and stock tune as well as a DLCM file.
5. Now you can go back to the Bronco and download the FP tune.