Archive named for the P-660HW-T1 v3 ADSL wireless router, hardware revision 3. At only 268 bytes the RAR is far too small to contain a real firmware image. It most likely holds a text note, a link or a placeholder, or the archive may be broken. Do not count on it as a flashing source for a bricked unit. Look for a full-size image matching the revision on the device label, and keep a copy of the existing configuration and firmware before changing anything on the router.
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 →