FIS1100 (IMU)/ I2C/ Arduino
I think you'll find you need to add some pull up resistors to both connections on the I2C (SDA and SCL).

Also I'm not sure what you should be pulling them up to 3.3v or 5v.  You should check if you need a level shifter or if the device you are connecting is 5v tolerant.

According to you question you should be using the address 0x6A.  0x6B is when you have an external pull up resistor, which I don't think you do have.  So your code is correct.