This is where it gets technical. This string likely represents the firmware version or a specific hardware revision.
To fix this error, you must bypass the corrupted firmware loop and reflash the controller using the correct version of AlcorMP mass production software . Step 1: Force the Flash Drive into Hardware Test Mode
[Extract Chip Data via ChipGenius] ──> [Match Flash ID (FID)] ──> [Download Compatible AlcorMP] ──> [Configure & Run Low-Level Flash] Step 1: Extract Exact Hardware Data
A healthy USB device identifies itself with a (Vendor ID) and PID (Product ID). For example, Alcor’s official VID is often 058F . If Windows sees 058F:FA00 , it looks for a driver. If none exists, you get the "Unknown" status.
controller series. Seeing "Unknown" alongside this code usually indicates that the diagnostic tool cannot fully communicate with the chip, often due to firmware corruption or physical defects. Key Technical Profile Controller Model: Generally identified as AU6989SN-TA Common Issues: alcor micro unknown fa00 f w fa04 top
Wait 2 seconds for the Windows connection chime, then immediately remove your needle or tweezers.
Press the Refresh button, or enter your drive's VID/PID as "058F1234" (if it's a typical Alcor) and press Add VID/PID , then Save .
Change the down to Full Scan4 or Full Scan 1 . This tells the compiler to thoroughly check every single block instead of relying on the broken internal controller log.
Standard operating system tools like Windows Disk Management or diskpart cannot resolve this issue because the drive is stuck at a lower, hardware-level layer. To restore the drive, you must reload the controller configuration using dedicated tools. Step 1: Extract Deep Chip Profiles This is where it gets technical
If the controller is verified as Alcor Micro, you can re-flash the initial firmware using the Alcor Mass Production Tool (). Step 1: Download the Exact Tool Version
With the drive , place your tool across two data pins on the NAND flash chip (typically pins 29 and 30, or alternative adjacent data I/O pins) to form a brief electrical short circuit.
: The diagnostic tool being used may be too old or not specifically designed for that exact Alcor hardware revision .
The other critical information from ChipGenius is the . This code identifies the exact NAND flash memory chip soldered onto the drive, which can vary dramatically. The "FA04" in your query is the firmware version, with other variants like "F0FB" or "C2DE" also common. The combination of the controller (FA00) and the Flash ID tells the repair tool exactly how to communicate with the hardware. Step 1: Force the Flash Drive into Hardware
: Many low-cost or unbranded USB drives bought online use generic Alcor Micro chips paired with rejected, low-grade NAND flash memory. These drives are hacked to report inflated storage capacities and break down once data hits the physical limit.
To troubleshoot this loop effectively, you must understand what each fragment of the log string means:
: You are likely dealing with an Alcor Micro USB 2.0 Multi-Card Reader (supporting SD, MMC, and possibly MS or xD cards) that has entered a low-level or fallback mode. Alternatively, it could be a firmware-bricked device showing a bootloader interface instead of a functional reader.
