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Changes
3. Edit /boot/config.txt and add below code.
nano /boot/config.txt
And add below codes:, then save & exit;
dtparam=i2c1=on
dtparam=i2c_arm=on
4. Edit /etc/modules-load.d/raspberrypi.conf and add below code.
nano /etc/modules-load.d/raspberrypi.conf
i2c-dev