Why LSM6DS3 accelometer sample rate doesn't increase?

Accroading to Arduino Forum,
I tried to change some codes on SparkFunLSM6DS3.cpp

and want to change sample rate from 416Hz to 6664Hz
line 505 : writeRegister(LSM6DS3_ACC_GYRO_CTRL1_XL, 0xA0);
But the result doen't change

so what should i do?

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