Before downloading any software, you must confirm your hardware. Use a utility like or Flash Drive Information Extractor . Controller: Alcor AU6989SN-GTC Flash ID: (e.g., SanDisk, Toshiba, or Samsung NAND)

Insert your corrupted USB drive into a direct motherboard USB port (avoid external USB hubs). Launch the diagnostic tool.

Look for archives named exactly:

The default password is blank. Press Enter to proceed. Some versions may use "320" or "123456", but the vast majority of Alcor tools have no password.

Ensure it automatically detects your correct NAND flash type.

Capacity Optimize: Prioritizes saving bad blocks to maximize total storage space.

Download a trusted USB diagnostic tool like or Flash Drive Information Extractor (Innostor) .

Click on the button on the right side of the screen. If prompted for a password, leave it blank and press Enter.

This is the main utility for "flashing" or repairing the controller. Versions that explicitly support the GTC variant include: ALCOR U2 MP v21.06.01.01 (and later versions). ALCOR U2 MP v19.01.24.00 . AlcorU2MP 20.09.16.MD (modified editions).

In the section, ensure the software has automatically detected your Flash ID correctly. Under the Optimize settings, you can choose between: Speed Optimize: Prioritizes faster read/write speeds.

: The vanilla software suite used to configure the chip. It uses specialized encrypted memory lists ( flashlist.afl ) to pair your specific physical flash chip with the correct firmware parameters.

This can take anywhere from 5 to 60 minutes depending on the capacity and health of the NAND. Troubleshooting Common Errors