On the 33 BLE rev2 I'm aware that the interrupt pin on the IMU has unfortunately not been attached to the MCU. Has anybody tried soldering a wire to one of its pins and plugging the other end into one of the digital input pins on the Arduino board? In theory this should work. However according to the Datasheet of the BMI270 registers 0x53 and 0x54 control the behavior of the two interrupt pins, and it's unclear what those registers have been set to on the Arduino Nano 33 BLE rev2.
Such modifications are standard practice. Of course, be extremely careful to correctly identify the pins, and avoid forming solder bridges between adjacent pins.
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