I performed many compass calibration procedures, even followed the YouTube video exactly as shown. The end result is the following:The displayed heading using the EV3 Read ABSIMU program jumps around quite a bit and doesn't seem to track turns. The heading jumps 100+ degrees, all over the place (the red side is facing up)Using the EV3 Read ABSIMU program it occasionally says "Read Error A/T" and "Read Error H" and "Read Error G" at the bottom of the screen of values. Then I would like to be sure the firmware is current (1.20) but when I try to download the Explorer program from the PC it gives this message: Unable to compile some documents for deployment:Read Device Info.ev3p: Use of a block which no longer existsSo there's two problems here. Would appreciate some ideas on the compass values jumping around and the error message.