2021 Ford F150 Smart key (all keys have lost) is done with Autel IM608 and Autel apb131 adapter.
Need to remove BCM and reading the D-flash with xp400 pro and apb131.
BCM location:
The BCM is located on the passenger side at footwell it’s not the easiest thing but it ain’t terrible take you about 15 minutes to get it out.
Where’s this option in Autel IM508/IM608?
Menu path:
Manual by vehicle->then go to Smart key learning->Read D-flash via programmer
You can see the wiring diagram. Reading the d flash not an easy task but if you have the soldering skills it’s very achievable.
Besides for the one hot connection to that little bitty capacitor it’s actually very easy to solder up.
After reading d-flash data, just learn smart keys.
You can also do it with FDRS. It takes 5 minutes with FDRS. FDRS is like $900 / year.
If some failed on F-150 with active alarm using FDRS, you can try this way with apb131.
The new apb131 adapter is pretty sweet. It adds a whole bunch of support for Volkswagens without removing resistors from the cluster.