When these tools report "Unknown" or specific hex codes followed by "Hot," it typically points to one of the following hardware or firmware failures:
To fix the [FA00] / FW FA04 error, you need an MPTool that matches your controller version.
The exact version of AlcorMP that matches your Flash ID. You can find these tools on database archives like USBDev or FlashBoot. Repair Procedure
When Windows displays an "Unknown Device" or "Mass Storage Device" with a faulty driver, it means the operating system recognizes a device is plugged in but cannot communicate with its flash memory, often resulting in:
Many Windows laptops (Dell Latitude, Lenovo ThinkPad, older HP Pavilions) use Alcor Micro readers. After a clean install of Windows 10 or 11, Windows often labels the reader as "Unknown Device" with the FA00 ID because Microsoft removed legacy driver support for older flash media formats (like xD-Picture Card or Memory Stick Pro Duo).
This specific error occurs exclusively on USB flash disks using (often the AU6989 series). The string Unknown [FA00] and firmware status FA04 are not legitimate specifications. Instead, they indicate that the controller chip has entered a hard crash state, lost communication with the NAND flash memory, or experienced a physical electrical short-circuit. 1. Decoding the Error String
Under the tab, change the power configuration to 200mA to lower the drive's operating current and control the overheating.
This is the (Hardware ID). For Alcor Micro, different numbers represent different functions:
Go to a reputable firmware library and locate the specific software version tailored to your chip family. For [FA00] errors on AU6989 controllers, older versions like AlcorMP 16.11.01 or specialized AlcorMP DBR releases are highly successful at forcing a connection. Step 3: Forcing Detection via VID/PID Modification
0 MB on a 32GB USB stick - Storage Devices - Linus Tech Tips
When an Alcor-based flash drive enters this state, software utilities like ChipGenius, Flash Drive Information Extractor, or AlcorMP read raw data straight from the controller's ROM layer. The data returned tells a highly specific story:
Short-term mitigations
For FA00/FA04 identifiers, users often find success with AlcorMP editions by nat27 which are optimized for generic or "fake" Alcor chips.