Mass production issue. ( the download firmware auto changed ? )

Hi All,

I have a couple of mass production issues, please advice:

Issue A.
Step 1. The product was pass the ATE test, when it go through the
production line.
Step 2. Randomly choose fewer samples to do hand test.
Step 3. Some samples fail, compare the firmware, it is different to
correct firmware. ( but it pass the firmware check in ATE station! @@~)


Issue B.
When test by hand and found a fail unit, the firmware is the same (
correct ), but behavior is different ( fail ) ( also pass the ATE test
at beginning).
In this case, we saw different EE behavior ( a power pin has different
behavior, it should no voltage at this moment, but it has), but after
re-download the firmware, the problem gone!


Please kindly share with your experience or any comments.

Thank you very much!
Best regards,
Boki.

.

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