RAR archive of 1.65 MB holding firmware for the P-660HW-T1 v3, with the P-650HW also named in the title. Both appear to be ZyXEL ADSL wireless routers, so the package may cover either one or carry separate images. Unpack it and identify which file belongs to which model before flashing. Recovery is normally done by TFTP or a serial console when the web page is unreachable. Check the model and hardware version on the sticker under the device, since a mismatched image can disable the unit.
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 @afsbiosfree. 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 →