: The low-level software ( F/W 3613 ) that manages the NAND flash memory has crashed or become unreadable.
If your USB flash drive has suddenly stopped working, shows "No Media", is write-protected, or displays 0 bytes of capacity, you are likely dealing with a corrupted firmware issue. When checking the device using a low-level hardware diagnostics tool like ChipGenius, affected users frequently see the status: .
Enter the unique hardware IDs of your USB flash drive (typically 058F for Vendor ID and 6387 for Product ID).
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: Under the Other tab, change the USB Current Power value to 200mA or 500mA to ensure the controller has enough power during the flashing process.
The controller relies on a small bit of firmware to map out data blocks. If a write operation is interrupted by pulling the drive out without using "Safely Remove Hardware," the firmware can corrupt. The drive then drops into a low-level fail-safe mode, reporting itself as "Unknown FA00". 2. Unreadable Flash Memory (Missing FID)
To confirm this is the correct device, you can check your Device Manager. The Hardware ID usually matches: : The low-level software ( F/W 3613 )
The microcode inside the logic chip is corrupted, causing it to fail to broadcast its true part number (e.g., AU6989AN, AU6998SN) to the operating system. 2. The Firmware Tag: F/W 3613 (or F/W F103 / F112)
Alcor Micro (headquartered in Taiwan, stock code 8054) has been designing controller chips since 1999. Its product lines include:
Alcor Micro Corp., founded in 1999 in Taiwan, is a fabless semiconductor company specializing in high-integration IC design. The company's portfolio spans USB flash disk controllers, card reader controllers, USB hub controllers, and SSD controllers. Alcor Micro maintains an international R&D center in Santa Clara, California, and serves global markets with its controller solutions. Enter the unique hardware IDs of your USB
“Alcor Micro device re-enumerated as ‘Unknown (FA00)’ after firmware push. Revision F/W 3613 confirmed. No mass storage volume — dead PID/VID mapping. Likely bootloader lock or corrupted config descriptor. Attempted forced mode switch via vendor command 0x36 — no ACK. Rollback to 3609 restores function. Conclusion: 3613 blocks generic UFI commands on this die revision. Mark as DO NOT UPDATE unless VID is explicitly Alcor’s own.”
Ensure you use a native rather than a USB 3.0 or external hub.