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If these steps do not work, it is possible the flash memory chip itself has suffered electrical failure, which is a common issue with older Alcor-based drives. Proactive Tips for Preventing Storage Failures
Software fixes rarely fix physical overheating and may cause the device to "pop." How to Fix the "Unknown Device" Error
Description Some devices using the Alcor Micro USB controller report the controller enumerating with unknown vendor/product codes FA00 and FA04 and exhibiting excessive heat during operation. This issue covers detection, impact, and suggested mitigations. alcor micro unknown fa00 fw fa04 hot
When these tools report "Unknown" or specific hex codes followed by "Hot," it typically points to one of the following hardware or firmware failures:
If you encounter compatibility errors, try setting the Channel to "Single Channel" in the settings, though this will cut the drive's capacity in half.
Choose "Update Driver" and select "Search automatically for updated driver software". This public link is valid for 7 days
Gently crack open the plastic casing of the USB drive to expose the circuit board.
First, let’s demystify the manufacturer. is a Taiwanese semiconductor company. You may not know their name, but you almost certainly use their hardware. They are the world’s leading supplier of USB 2.0 and USB 3.0 card reader controllers .
Fixing this issue usually involves re-flashing the controller firmware using special Chinese-developed manufacturer tools, as standardized Windows drivers often fail. Step 1: Identify the Controller Can’t copy the link right now
Many Alcor Micro-based drives sold at low prices are "fake capacity" drives. When they fail, they revert to their base controller ID (FA00). Recommended Fixes
✅ Generic Microsoft driver from 2006 usually works for basic SD readers.
Run the tool on a 32-bit Windows environment if possible, as these low-level drivers often fail on modern 64-bit systems. Click on to configure the firmware parameters.
Every NAND memory chip contains a unique hardcoded identifier called a Flash ID (FID). The Alcor controller must read this ID during boot to know how to map data sectors. If data traces break due to physical drops, flexing, or thermal stress, the controller returns No FID , defaults to Unknown [FA00] , and stalls into a power-loop. Step-by-Step Recovery and Repair Protocol
The drive's light flashes rapidly but never initializes. How to Fix the "Unknown FA00 FW FA04" Error