I'm also working with support on this issue, but I thought I would try out the community as well...
We just did our Jump Start training in early December. When the trainer was here we created a Base Image using the 10.11.1 installer and AutoDMG. The configuration called "Base System" only has 4 things. It has the clean AutoDMG created system DMG and 3 scripts. One script joins the WiFi, one sets the timeserver, and the last sets the timezone. It is also setup to create a Management Account (hidden) called Casper. All of this works perfectly with the 10.11.1 system.
After the JumpStart training (I think literally the day after he left) 10.11.2 came out. I thought I would go ahead and update the Base Image before I went any further. I downloaded the new "Install OS X El Capitan.app" from the App store, updated AutoDMG and created a new DMG for 10.11.2. I updated the Base System configuration to use this new image instead of the old one.
When I use this updated configuration to image a test system (MacBook Air) (via Casper Image and Target Mode imaging) the system gets laid down just fine, but the wifi script doesn't work and it never connects to wireless. It also doesn't create the hidden Casper user. I've recreated the DMG 3-4 times. If I plug it into the network via thunderbolt network adapter before the first reboot after imaging it will connect and associate with Casper, but the wifi script still never joins it to the wireless. I do know that the script is actually running at some point because I added a line to the bottom of it for testing to "touch /users/Here.IAm" and the file gets created on the test system.
Support has been very responsive and we have gone back and forth but haven't found a solution. I'm wondering if I'm missing a step that everyone else using AutoDMG to create a never booted image uses to get a MacBook Air connected to WiFi on first boot uses. I did see someone suggest adding a configuration profile for the wireless into the AutoDMG image with a utility that makes a pkg for the configuration profile. I haven't tried that yet.
Thanks for any suggestions,
Scott
