I am trying to mass image some Macbook Air's. The process that I use on the old white MacBooks were to start them up and manage them with ARD and set the startup disk to my casper net boot image. Now with my new computers I do the same thing and they get the command just fine. They then restart but when the blinking globe appears and blinks 15 times then boots to the regular OS. I have tried with both USB and Thunderbolt adapters with no luck. If I power them on and hold down the option key and type in the firmware password and select the image it will netboot just fine but this takes so much longer.
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