Wow, that's a long message!
The multiple errors reading DIDs makes me thing your having trouble with the OBD cable/connector. What type of adapter are you using?
Not sure if this is the same issue or not, but when I updated the APIM module (Sync) it messed up the GPS for a little while. But I did a force reboot of Sync (while I was driving) and the GPS started working again immediately after the reboot.
On the steering wheel controls, press and hold...
Not sure what charger/power supply you used, but I do know that a 20 amp should be able to keep up depending on the starting state of the 12V battery. I have a 20 amp charger/power supply. I made sure the battery was at a good state of charge before beginning and then put the charger in power...
If your BC was working, it didn't go away. Sometimes, depending on the angle of the sun and the visibility of the lines, BC won't work at one time, and then it will the next.
Also, it took almost a week before the BC showed in my connected services after the updates were installed and BC had...
There's one newer APIM/Sync module than the one you are on, but for most people, the version you're on is the one required for BlueCruise.
The newer version was just released this past weekend.
The crazy thing is that Sync4A can be updated via USB. That's what FDRS does to update it (the APIM module). It copies the files to a USB and then installs via USB. Just like the old Sync versions (from the original to Sync 4). It's just Ford isn't allowing us to download the Sync Update for...
If I remember correctly, there are lights at the bottom right corner of the FDRS screen that will tell you if it's connected to Ford servers, the vehicle, and maybe one other.
I followed the prompts in FDRS. Most of the non-USB updates prompt you to be in accessory mode (Key on, engine off). The USB updates prompt for Ready mode (Key On, engine on). I have no idea if it makes a difference other than the instructions were probably written for ICE vehicles.