The chip usually grinds out the words because:
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1. The most important thing is that the manufacturer prevents others from copying the board (which can be understood as copying the components down according to the sample), so that others cannot see the chip, and the manufacturer does not want others to know what chip they use.
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2. The chip is not coming from the right way and needs to be covered up. For example, this chip should not be in circulation on the market, the date is wrong, etc.
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3. Shoddy, overclocking use. This chip is used to replace a higher level model in case of detection.