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Please refer to BNO055 quick start guide app note online at https://www.bosch-sensortec.com/media/boschsensortec/downloads/application_notes_1/bst-bno055-an007.pdf for more information. Please make sure you have set the right I2C slave address, added two 10K Ohms pull-up resistors on I2C bus and set STM32 MCU I2C clock frequency to 100KHz, etc.
Please use a USB logic analyzer to capture the I2C transactions for debugging. If there is still a problem, then please contact STM32 FAE for support.
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