Need to flash my old firmware from "dump.bin"

How do I reinstall or re-flash my original, saved (as “dump.bin”) firmware? I want to use the new 2.18 firmware from NEC for the NEC NV-3500A? (See it at http://www.de.nec.de/softwareoverview2.php/id/557/lang/ENG ). I am currently using TDK 2.c8 firmware to access Traxdata DL disks. the New NEC firmwqare will only install on top of 2.16–my original firmware.

Use the Win32 GUI version of binflash: http://binflash.cdfreaks.com/

You might be able to use that program to flash straight to the 2.18 firmware if you point it to the .exe file.