You flashed firmware for a different NAND density. Reflash with the correct 16GB parameters.
Use ChipGenius (Windows) or lsusb -v (Linux).
Look for:
Controller: SSS6698-BB + NAND ID (e.g., 98 DE 94 93 76 51 – Toshiba) Sss6698-bb Firmware 16gb
Follow these steps exactly. Any deviation can make the drive unrecoverable. You flashed firmware for a different NAND density
If your drive is completely dead (no LED, no detection in Device Manager): Under Advanced :
Before you attempt to flash anything, you must identify the exact firmware revision currently on the drive (or the one intended for your specific NAND flash type).