IMU 9250 and 6050 not working on new vesc 4.12 and 4.20

Hi  

I have downloaded the latest firmware 5.2 to my vesc 4.12 but the imu will not connect .  

I thought I had a faulty Vesc but tried it on the second one still the same , it is in balance mode IMU data only shows green flat line is it the lastest firmware causing it? 

I tried pull up 10k resistor to no avail. What am I doing wrong?

Trung