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How can I judge fake chip or not @ stm32f103cbt6

Question asked by yuichi kawamura on Dec 4, 2017
Latest reply on Dec 4, 2017 by Clive One

I knew most stm32f103cbt6 implemented in Blue Pill (STM32F103C8T6_Hello - a mercurial repository | Mbed ) is fake.



One of my friend says "if F is printed on the second line, it's fake"
Is it true? and how can I judge fake or not correctly?