USB flash drives rely on a hardware controller—a tiny processor managing data flow between your computer and the raw NAND flash storage chips. Alcor Micro is a highly common controller brand utilized by manufacturers like Transcend, SanDisk, and generic promotional brands.
To fix this specific error code, you will use . Step 1: Download the Target AlcorMP Version
A sequence like 45 3E 98 03 or AD DE 94 EB . If this reads 0xFF 0xFF 0xFF 0xFF , your controller cannot see the memory pins at all.
Alcor Micro is a Taiwanese semiconductor company that designs USB 2.0 and USB 3.0 flash drive controllers. They are one of the "Big Three" controller manufacturers (alongside Phison and SMI). If you have a generic, no-name USB stick, or even some branded ones (Kingston, ADATA, Transcend), there’s a high chance it has an Alcor controller (e.g., AU6989, AU6990, AU6470 series).
The progress bar inside the active device box will change colors (usually turning yellow or blue) and show status messages like "Analyzing Flash," "Erase Flash," or "Low Format." alcor micro unknown fa00 f w fa04 fixed
: This is not a real Alcor controller model. The AlcorMP mass production tool returns FA00 as a generic fallback code when it cannot communicate with the NAND flash memory to read its unique Flash ID (FID).
The "Alcor Micro Unknown FA00 F/W FA04" error typically indicates that your USB flash drive's controller (often the AU6989SN-TA
Click the corresponding drive box or click to begin writing the pristine factory firmware.
Across major forums (USBDev, Reddit’s r/datarecovery, MyDigitalLife, and BadCaps), users report success when they follow a specific workflow: USB flash drives rely on a hardware controller—a
How to Fix the Alcor Micro "Unknown FA00 F/W FA04" USB Error: A Complete Guide
To fix this, you must "re-flash" the controller using the specific mass production tool that matches your chip. Identify the Chip: Use a tool like ChipGenius to find your exact Controller Part-Number (e.g., AU6989SN-TA) and Flash ID (FID) Download AlcorMP: Look for a version of that supports the
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Let me break down the possible meaning based on the structure: Step 1: Download the Target AlcorMP Version A
This is the trickiest part. You need to find a version of the AlcorMP tool that supports the FA00 (AU6989) controller series and contains a configuration for your specific Flash ID code. Search for "AlcorMP AU6989" or "AlcorMP FA00". The version numbers can look like v19.07.03.00 or v16.02.19.00 . Community forums like USBDev.ru, 52pojie.cn, and FlashBoot.ru are excellent places to find these tools, often with helpful guides.
: If the tool does not see the drive, you may need to manually short two pins on the controller chip while plugging it in to force it into "test mode," allowing the software to recognize it. Configure VID/PID : In the AlcorMP settings: Click Driver . Add your device's VID/PID (often 058F / 6387 or 058F / 1234 ). Save and refresh the tool.
Your "Alcor Micro Unknown FA00 F/W FA04" is now fixed .
You may need to adjust the settings. 4. Adjust the Setup Options