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IWR1642BOOST: How do I identify if the device is pre-production on evm

Part Number: IWR1642BOOST
Other Parts Discussed in Thread: IWR1443BOOST, , IWR1642

I have an IWR1443Boost and an IWR1642Boost. 

I'm in the process of updating the SDK and  MMWave Studio but I see that there are some platforms/devices that are not supported (ES1, ES2).  How do I identify if the evm is using pre-production parts?  I don't see a marking on the board or the chip with the ES designator.