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bq40z50: bq40z50 DF all empty

Part Number: BQ40Z50

Hello,

I met device DF all empty after SMT.

So confusing what conditions can cause it at the application side?

Like: ESD is possible to cause some data be cleared, not all DF.

If Battery factory CMD cleared, I believed that partical data be cleared.

Do you have some comment for my study?

Thanks!