I think my comment was not clear enough so let me clarify it again.
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There are 2 kinds of modules. One has sdcard slot on it but no emmc storage. Another one is vice versa.
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Sdcard image will only work for modules which have sd slot on it.
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We expect custom board will only work with emmc module. Emmc module is called production module and all our design guide document is written for emmc module.
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Even if you have a carrier board + emmc module that has extra sdcard slot. Sdcard image will not work on that either.