The firmware revision for ND-7551A is 1-P2.

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 "ND7551_BTR_DOS.ZIP" and copy extracted files to a DOS system.
-Plug the drive to the system. Boot the system and execute "7551BTR.BAT".
-When the firmware flash is completed, switch off the system.


[Main flash]
-Unzip "ND7551_v1P2_DOS.ZIP" and copy extracted files to a DOS system.
-Plug the drive to the system. Boot the system and execute "7551MAIN.BAT".
-When the firmware flash is completed, switch off the system.

This is the end of firmware flash process.
