Thanks for your inquiry.
BMI088 has accelerometer BMA456 and gyroscope BMG160 inside. The accel and gyro are independent which means they have their own FIFO and ODR, etc. They are not synchronized as BMI270. Therefore, only BMI088 accel has header byte in FIFO frame, while BMI088 gyro FIFO doesn't have header byte.
0x8C for FIFO frame comes from BMI270 datasheet page 35 at https://www.bosch-sensortec.com/media/boschsensortec/downloads/datasheets/bst-bmi270-ds000.pdf. BMI270 accel and gyro are sunchronized and share the same FIFO. We will correct this in BMI088 API code. Thanks for your feedback.
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