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There are two parts for this firmware flash. You need to flash "Boot" part first, then flash "Main" part of the firmware.

[Boot flash]
-Unzip "ND7550_BTN_DOS.ZIP" and copy extracted files to a DOS system.
-Plug the drive to the system. Boot the system and execute "7550BTN.BAT".
-When the firmware flash is completed, switch off the system.

[Main flash]
-Unzip "ND7550_v101_DOS.ZIP" and copy extracted files to a DOS system.
-Plug the drive to the system. Boot the system and execute "7550MAIN.BAT".
-When the firmware flash is completed, switch off the system.

This is the end of firmware flash process.

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