ATA version of firmware for ND-6650A. The firmware revision is 2.23. 
To flash the firmware from normal ATA version(1.22 or 1.22), please follow the instruction below.

1. Unzip attached zip file and copy extracted files to a DOS bootable disk.
2. Connect ND-6650A to secondary master. Do not connect anything on secondary slave.
3. Boot the system with the DOS bootable disk.
4. From DOS prompt, type "6650BOOT.bat" and press enter.
5. After the flash is completed, shut down the system.
6. Then boot the system with the DOS bootable disk again and confirm the drive is now seen at secondary slave. If not, please check the BIOS setup.
7. From DOS prompt, type "6650MAIN.bat".
8. After the flash is completed, shut down and reboot the system.