Hi George ,
If you check the picture of board, you see that U16 is a level translator . You can see the SCL and SDA pins are connected to it for the 3.0V and at the other side it is 1.8V for the microcontroller . Picture 5 is in the 3.0V domain and picture 4 is in the 1.8V domain.
You can see that the GNSS module does not give ACK 's.
Please check this post L96 GPS I2C problem
maybe the firmware need to have a SC suffix to support I2C ??
Thanks,
rschoop