Would someone please tell me why this happens with Python IDLE 3.9.0?
The fingerprint sensor model R307 could not be initialized with Raspberry pi 4 model B.
I used USB-TTL converter
the exception message: The received packet do not begin with a valid header!
Exchanging the pins, jumper cables, and baudrate (115200 or 57600 or 960000) bps but also does not worked.