You obviously don’t want help if you just going to be rude about people giving you options to help fix YOUR problem. Like I said and it’ll be my last response give it a couple of days or unplug the battery for a while and plug it back up. When we make changes like this to our trucks weird things happen you should be okay just take a deep breath and if that doesn’t help take care of the problem then if you made a backup start over. Sometimes it takes a few ignition cycles to get back normal. I had the same problem when I turned on PEB and after a day or two it stopped doing exactly what yours is doing right now.
OK, First of all I wasn't rude nor implying anything that might have and undertone of it, but if I have hurt anyone, Im sorry, that wasn't the intention.
Anyway, I want to say that I have fixed it! I went to a friends shop and out of a pure luck there was this 22 Rebel with ACC and LDW. I asked if I can take his BCM dump, and viola. He has "Cust.Set.Menu 3: Pedestrian Emergency Brake CSM Present- YES" and for the love of my live I just couldn't find that option in AlfaOBD for 2022+ DT BCM. I have pulled my old dusty android tablet that I remember using on my 2020 BigHorn but with 2019 DT (only that was available at the time) and under 2019 v4 there is a dozen if not more Cust.Set.Menu 3 options. One of them was Pedestrian Emergency Brake CSM Present. I have set it to YES and in my radio there was a new option under FCW to set to enable, and viola, my FCW works again like it used to 2 days ago.
Now I also cracked the option on how to connect with the most up to date AlfaOBD as 2019 v4 and all of the options are there. You just need to use Advance Mode when connecting, and after connected manually change the BCM connection from 2022+ to 2019 v4 or a different one if you desire.