For a USB flash drive: This is irreversible. The data is not recoverable via DIY methods because the controller cannot access the memory map. You would need professional chip-off recovery.
Following the re-flashing procedure with the correct AlcorMP tool, the device should be restored to its full capacity, and the "Unknown Device" warning will be resolved.
Frequently accompanied by a missing Flash ID (FID), meaning the controller is currently blocked from talking to the physical NAND flash memory chips. Why Is Your Flash Drive Showing This Error?
(e.g., EC3A94C3A4CA - Samsung ): The flash memory is alive. Move to Step 2 .
The controller is a newer or "fake" variant not yet documented in older diagnostic databases.
: Try FC MpTool (often used for lower-tier or counterfeit drives running Alcor clones). Step 3: Flash the Firmware Using Alcor MP alcor micro unknown fa00 f w fa04
Click to save configuration parameters, return to the primary screen, and press Start (A) .
Abruptly pulling the USB drive out during a write cycle desynchronizes the controller from the NAND flash storage.
Perform a or "Full Scan" to re-flash the firmware.
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[AlcorMP Main Dashboard] └── Button: Setup (S) ├── Password: [Leave Blank or press Enter] ├── Flash Type Tab ──> Channel: Single Channel (If dual channel throws errors) └── Scan Level Tab ──> MP Mode: Capacity Optimize └── Scan Level: Full Scan 4 (Deepest Bad Block Sweep) For a USB flash drive: This is irreversible
Alcor Micro production tools are heavily chip-dependent. Because your drive reports [FA00] , it is highly likely built on an variant.
The error string indicates that your Alcor Micro mass production tool cannot fully identify your USB flash drive's microcontroller chip or its firmware version. This specific issue commonly triggers symptoms like "Disk is Write Protected," "No Media," "0 Bytes Space," or the device flashing indefinitely without being recognized by Windows.
: If the Flash ID code (FID) is reported as something generic (like 898989898989
: Unplugging the USB drive during an active write cycle can scramble the controller's internal configuration blocks, throwing the hardware into a loop.
Go to the tab and set the current to 200mA to ensure sufficient power. Exit Setup. Following the re-flashing procedure with the correct AlcorMP
If the flashing run stops and drops an error code, use this reference table to adjust your approach: Error Code Error Message Name Root Cause & Resolution Too many bad block error
or similar variants. In a healthy state, these controllers manage the data flow between a computer and NAND flash memory. However, when the controller returns a status of "Unknown FA00" or "F/W FA04," it signifies that the device is in a bootloader or "test mode," unable to communicate with the internal flash memory chip. This is frequently accompanied by a "0 Byte" or "No Media" status in Windows Disk Management. Causes of "Unknown" Identification
If this appears as an error or unrecognized device, try updating the kernel, installing usb-modeswitch , or checking if the hardware is defective. Alcor Micro readers often require the usb_storage or uas driver with proper quirks.
Often identified as AU6989SN-TA or AU6989SNCS-TA . Firmware Version: FA04. Common Hardware IDs: VID: 058F (Alcor Micro).
Go to the AppleScripts section.