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CC3100MOD: How to identify a CC3100MOD is pre-production version or not?

Part Number: CC3100MOD

My customer purchased a batch of CC3100MOD from TI store for developing, but they found that the module can only work with servicepack 1.0.0.10 or before, not with later servicepack, therefore they suspect that the modules are pre-production version.

How to tell from the silkscreen of CC3100MOD a module is pre-production or not? I have found a post saying the CC3100MOD could come with a XCC3100HZ inside. Is it possible the module purchased from our TI store is a pre-production version?

Thanks.

Best regards,

Shuyang