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This is a symptom of SDA being pulled to ground. Test your GPIO with nothing connected to the extension header. See


The reason your I2C sensor isn't detected is that you've not soldered the header pins into the breakout board. There won't be a connection between Vin, GND, SDA & SCL to your RPi. The BME280 on your breakout board runs on 3.6V max, so don't connect Vin to either pin#2 or pin#4 use pin#1 or pin#17.

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