I still feel that the OP would simply state the process s/he is using to load the OS, we might help. But they have not.
If however the OP is fully knowledgeable on what is required by pre-release devices, s/he must be high enough up in the system to get that OS should they want.
Otherwise, were it me, I would troubleshoot the dickens out of the process and try many options. Just my opinion.
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