Alcor Micro Unknown Fa00 F W Fa04 Fixed -

The Alcor Micro "Unknown [FA00]" error indicates a communication failure between the controller and the flash memory chip.

The error signature Unknown [FA00] F/W FA04 is a classic symptom of a corrupted, unsupported, or physically damaged USB flash drive utilizing an Alcor Micro controller (such as the AU6989SN-TA series). 🔍 Technical Analysis of the Error

Unknown [FA00]: 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).

F/W FA04: This denotes the specific firmware version the tool is attempting or failing to read/write during the detection process.

No FID (Flash ID): When this error occurs, the software usually reports an FID of 00 00 00 00 00 00 or fails to read it entirely. Without an FID, the mass production tool does not know what type of memory is on the board and cannot reflash it. 🛠️ Root Causes & Fixed Solutions

The table below outlines why this happens and how specialized technicians and forum communities (like the Alcor Micro section on USBDev) address it. Technical Explanation Resolution / "Fix" Physical/Soldering Failure

A severed data line or fractured solder ball on the NAND chip prevents the controller from reading the FID. Requires hardware reflow or resoldering of the chip pins. Controller Logic Freeze

The controller is stuck in a loop reading corrupt data and ignores external software commands. alcor micro unknown fa00 f w fa04 fixed

Put the flash drive into Hardware Test Mode by shorting specific pins on the NAND chip. Incompatible Software

The version of AlcorMP being used does not possess the parameters for your specific NAND memory.

Download a community-modified version of the software, such as the editions by NAT27. ⚡ Step-by-Step Recovery Procedure

To fix this specific error, users typically follow standard mass production recovery procedures. Note that this process will completely wipe all data on the drive. 1. Identify the Physical Controller

Do not rely on software readouts since they are giving false FA00 data. Crack open the plastic casing of the USB drive.

Read the physical laser-etched model number on the small square chip (e.g., AU6989SN-TA, AU6989AN). 2. Force Hardware Test Mode

If the drive still shows FA00 or no FID, you must force the controller to ignore its corrupted firmware: Locate the large rectangular NAND flash chip. The Alcor Micro "Unknown [FA00]" error indicates a

Use a needle or precision tweezers to short circuit two data pins (usually pins 29-30 or 43-44 on a standard TSOP chip) right as you plug it into the computer.

Once the software detects the drive with a proper generic status (and hopefully reads a real FID), remove the short. 3. Use the Correct Mass Production Tool

Visit a database of production tools like the Alcor Micro Downloads on USBDev.

Download a modified version of AlcorMP or FC MpTool that matches your physical controller.

Open the program, insert the flash drive, click Setup, configure it to your flash type, and hit Start to overwrite the corrupted firmware. Alcor Micro - USBDev.ru

It looks like you’re trying to interpret a string of text that seems to describe hardware or diagnostic data — likely related to Alcor Micro (a company that makes USB hub controllers, card readers, and other ICs).

Let me break down the possible meaning based on the structure: "alcor micro" – Alcor Micro Corp

Text:
alcor micro unknown fa00 f w fa04 fixed

Possible interpretation:

"alcor micro" – Alcor Micro Corp. (e.g., known for USB 2.0/3.0 hub controllers, eMMC controllers, or smart card readers).
"unknown" – The device or chip could not be fully identified automatically by a driver, tool, or firmware.
"fa00" – Possibly a vendor/product ID (VID/PID) or register address.
- In USB terms, FA00 might be a product ID assigned by Alcor.
"f" – Could indicate a flag, revision, or function number.
"w" – Might stand for "write", "word", or "wait" in a debug context.
"fa04" – Another register address, product ID variant, or configuration offset.
"fixed" – Likely means the issue (detection, fault, or firmware bug) has been resolved, possibly by patching drivers or firmware.

Decoding the Error: "Alcor Micro Unknown FA00 F/W FA04 Fixed" – A Complete Guide to USB Drive Recovery

By: Data Recovery Experts

Step 3: The Mass Production (Formatting & Firmware Flash)

Click OK to save your settings.
Back in the main window, click the Start or Space Start button (sometimes the button is unlabeled—look for a triangular "play" icon).
Wait. The process can take 5 to 30 minutes depending on the drive size.
- Progress 0-50%: Firmware is being written to the controller.
- Progress 51-100%: Low-level scanning and bad block remapping.
When finished, you will see a green circle with a "PASS" or "OK" message.

If you get a red "FAIL": Usually code 0x02 (Bad block too many) or 0x03 (Flash ID mismatch). This means your NAND chip is degraded. Try "Erase All Blocks + Low Level Format" again, but accept that the drive may be dying.

What is PID FA00?

The Product ID FA00 is a "fallback" or "boot" ID. It indicates that the Alcor Micro controller has entered a specific state where it cannot communicate its full feature set to the host OS. This occurs for two primary reasons:

Missing Firmware/Blob: Some Alcor controllers require a firmware blob to be loaded by the OS driver upon initialization. If the generic Microsoft driver attempts to take control instead of the specific Alcor driver, the firmware load fails, and the device reverts to a basic state, reporting FA00.
Internal Flash Corruption: In rarer cases, the internal flash descriptor of the card reader has been corrupted (often by a failed BIOS update that interacted with the USB controller), causing the device to lose its identity.

4. Likely Problem

The drive is not recognized properly by standard OS tools (Windows Disk Management, Linux lsblk), but an Alcor MP tool detects it partially as FA00.
The FA04 fixed indicates a manual configuration was applied to force the device into a working state with fixed disk mode.

Technical Analysis: The "Alcor Micro Unknown FA00" Phenomenon and the FA04 Resolution

Subject: USB Device ID Mismatch in Alcor Micro Card Readers (VID_058F) Keywords: VID_058F&PID_FA00, VID_058F&PID_FA04, Internal Flash Descriptor, Windows Device Manager.

6. Caution

Alcor firmware tools are sensitive to version matching. Using the wrong FA04 firmware can brick the device permanently.
Always verify VID/PID and controller revision before flashing.