I had to go to my dealership to have them install the updated. They told me that they may not be able to do the updated if I did not have the correct revision of several modules. If they were all correct then they would start the updated and if not they would have to order the correct ones. That...
I called the service department and told them I didn't have my VIN however I know all the features that my truck had. He asked a series of questions on what features my truck has. After that the system told him what wiring harness was applicable to my vehicle. I have since ordered and installed...
"ML3Z13A576j or ml3t-13a576-akb same harness just different ways for the dealer to look up " is the correct harness for a 2021 f150. I just finished installing mine it's like it was made for it 😉