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It looks like the new M3s can't be upgraded OTA at all. Apple probably needs to turn on the model ID so the update server can send down the right package installer. I'm going to see if it's possible to restore the latest build via Apple Configurator.
 
I tried using a second computer to restore my new M3pro with the IPSW 14.2 beta file but received this message. Perhaps I am doing something wrong?
 

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