RAR archive of 1.62 MB with firmware for the NBG-418N hardware version 2, a Zyxel wireless N router. The firmware build itself is not named, so extract the archive and check what it contains. Technicians use these images to restore routers stuck in boot or with corrupted firmware, via the web upgrade or bootloader recovery, or by writing the flash chip directly. Version 1 and version 2 hardware are not interchangeable, so verify v2 on the label and save the original image before flashing.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @biosarchive. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →