Firmware upgrade failed - SanDisk X100 SSD on ThinkPad X1 Carbon

I downloaded the corresponding ISO file, and made a bootable USB from the Toolkit in Windows 8.  Everything was fine until I boot up and select my SSD to upgrade the firmware.  A red dialog showed up.  When I tried to exit, I see the following error message that might be useful:

SATA IS in AHCI mode.

Any help would be appreciated.  Thank you!

no need to post in mutiple threads.