I just upgraded to 3.04. Assistant 3.0 software tells me I must advance calibrate my IMU. Basic calibration and check IMU are grayed out so cannot click on them. I see the other post about not getting IMU to advance calibrate so I followed suggestions from that thread. I burned through 2 batteries, multiple reboots, reloading software and it still won't calibrate. Walked away and came back hours later to no luck. I downgraded firmware to 1.08 and the IMU calibrated it almost no time. At least now it will let me turn the motors on and fly. I then upgraded to 3.04 again. Assistant software at least now doesn't tell me that I need to do an advanced calibration but the basic calibration and check IMU buttons are still grayed out. Is it okay to fly with the calibration that I obtained from 1.08 firmware or since I upgraded it again to 3.04 does it need to be redone?