You are trying to use the file copied from Navicom update site. This file is coded and uncoded by setup program after device ID check. W/o custom convertor your file is useless.
You can use Winhex.exe for the conversion.
Open the original image file, type CTRL+A (select all), CTRL+T, choose "XOR", put value "FF" and process. After that you need to change ASKIMG to DSKIMG in the file header.
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