| Symptom | Likely fix | |----------------------------------------|-------------------------------------------| | Unknown, cool, no card inserted | Normal – insert card | | Unknown, cool, with card inserted | Driver or reformat card (FAT32/exFAT) | | Unknown, hot, with/without card | Hardware failure – replace device | | Shows as FA00 in Linux, no storage | Firmware corruption – needs MPtool (risky)|
If you're encountering issues with an Alcor Micro device with firmware versions FA00 or FA04, here are some steps you might consider:
Compatibility Issues: Ensure that your device and firmware are compatible with your operating system. Sometimes, older devices may have issues with newer operating systems, and vice versa.
Reinstall Device Drivers: If your device works intermittently or not at all, try uninstalling and then reinstalling the drivers for your device.
Check for Conflicts: Other devices on your system might be causing conflicts. Check for any USB devices that could be interfering.
Unfortunately, this keyword can sometimes mean death. If you have tried the above steps and the device remains "Unknown" with a Code 43 (Windows has stopped this device), check for physical damage.
Sometimes the "Hot" flag indicates the device is stuck in a low-power state.
If you have tried the AlcorMP tools and the device is still unrecognized, or if it continues to run hot instantly upon insertion, the controller chip is likely physically dead.
USB flash drives have a limited number of write cycles. When the controller fails, it often does so silently, or in this case, loudly—by generating heat and showing up as an "Unknown Device." alcor micro unknown fa00 fw fa04 hot
These codes usually imply a firmware mismatch. The controller is waiting for a host command to load the firmware.
Warning: This process carries a risk of damaging the controller permanently if the wrong firmware binary is forced. Always use the specific MP Tool designed for your exact controller model.
"Unknown FA00 FW FA04" is a specific firmware corruption status reported by Alcor Micro USB controller
mass production tools (MPTools). This message typically indicates that the flash memory chip (NAND) is not correctly identified by the controller, or the controller's firmware has failed to load. Troubleshooting the Error
This error often occurs when attempting to repair a "write-protected" or "raw" USB drive using the wrong version of the Alcor MPTool. Verify Chip Details : Use a diagnostic tool like ChipGenius Flash Drive Information Extractor
to find your specific controller part number (e.g., AU6989SN-GT) and the Flash ID (FID). Download Compatible MPTool
: Do not use generic tools. Visit specialized databases like FlashBoot.ru
to download the specific version of AlcorMP that supports your controller and NAND combination. Adjust Settings : If the "FA00" error persists, open the MPTool's (often requires a password like or leaving it blank) and ensure the Scan Level If you're encountering issues with an Alcor Micro
is set to "Low Level Format" or "Full Scan" to force the controller to re-identify the memory blocks. "Hot" Hardware Failure Warning If the USB drive becomes physically
to the touch when plugged in alongside this error, it often indicates a hardware short-circuit: Internal Short : The controller or a capacitor may have failed. Voltage Issues
: Ensure you are using a direct motherboard USB port rather than a hub, as power instability can trigger both heat and firmware errors. Data Recovery
: If the drive is hot and showing "Unknown FA00," the NAND chip might be dying. Unplug it immediately; software tools like AlcorMP will likely fail and could permanently damage the data. Summary of Status Codes
: Generic "Unknown" firmware error, usually solved by a correct MPTool version.
: Specific identification failure where the controller can see a chip but cannot communicate with its registers.
This issue typically indicates a hardware failure or a critical firmware mismatch in your USB drive's Alcor Micro controller
. When a drive shows as an "Unknown Device," displays an "FA00" error code, and becomes physically hot, it usually means the controller chip is either short-circuited or stuck in an infinite boot loop due to corrupted firmware. Core Problems Identified FA00 Error / No FID Compatibility Issues : Ensure that your device and
: This code often appears when the controller cannot communicate with the NAND flash memory chip (the part that actually stores your data). Overheating
: Rapid heating is a sign of an electrical short or the controller drawing excessive power while trying to initialize failed hardware. Firmware Mismatch
: The "FA04" or "FA00" designations are internal Alcor status codes indicating the controller model (like the AU6989SN-TA ) is not properly identified by standard drivers. Recovery and Fix Attempts
If you want to try and "revive" the drive, follow these steps, but be aware that physical heat often suggests the hardware is permanently damaged.
If that device is a cheap USB flash drive or no-name card reader and it’s physically hot:
Do not keep using it. It can damage your USB port or computer. Replace it.
If it’s cool but unknown, try a different SD card or reinstall the generic USB mass storage driver.