[Q] G Sensor Calibration

[sliq.ric]

Ever since Miui and Cyanogen moved over to Gingerbread (2.3) my HTC EVO's acceleromtor has been off set. Since there's no built in g-sensor calibration like in previous Android builds how do I correct this? I need some type of fix to correct the screen rotate issues i'm having through MIUI 1.5.27 ROM. PLEASE HELP!