fake and the original chip...

[rifatdanur]

how to tell the stm32(f103c8t6) chip between the fake and the original

[TDK]

No test can be perfect, but this does a pretty comprehensive job:

https://mecrisp-stellaris-folkdoc.sourceforge.io/bluepill-diagnostics-v1.6.html

Generally, if you bought it from ebay or amazon or another purveyor of fake and counterfeit goods, it's likely fake. Official distributors will likely be genuine.

 

 

[Tesla DeLorean]

Review the top side markings, and electronically reported JTAG identification and DBGMCU DEVID