Firmware archive for a device identified as P-660HN-T1H, delivered as a 1.36 MB RAR. The name gives no brand, but the model string resembles ZyXEL ADSL router naming, so verify the device before use. Router firmware like this is either flashed through the web interface or written directly to the flash chip with a programmer to recover a bricked unit. Confirm the hardware version on the label matches. Back up the existing flash, since calibration and MAC data may be stored there.
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 →