Check you have the latest software and firmware installed. See these guides for more info:
- Software Updates
- Firmware Updates

As of this post the latest versions (GA releases) are:
- 7.5.6 Build 133
- 8.1.2 Build 115
- 2.06.41 FlashScan V2 firmware.

Also, set your cable selection properties in the Scan Tool as per this image:
http://forum.efilive.com/attachment....6&d=1287888148