By: Data Recovery Experts Introduction: The Frustration of the "Unknown Device" You plug in your USB flash drive. You hear the familiar "ding" from Windows indicating a connection. But then, instead of seeing a new drive letter in "This PC," your heart sinks. You open Device Manager , and under "Universal Serial Bus controllers" or "Other devices," you see a yellow warning triangle next to a label that reads:
This error is infamous among technicians and everyday users alike. It signifies that your USB controller (manufactured by , a leading producer of USB flash drive controllers) has entered a firmware failure state. Specifically, the FA00 (Device ID) and F/W FA04 (Firmware version FA04) indicate the controller is not communicating its true NAND flash parameters to the operating system.
Look for AlcorMP_AU6989_FA04 or AlcorMP v14.03.08.00 . Do not use the newest version; use one released around the same era as FA04 firmware.
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