Firmware archive for the P-660RU-T1 v2, a model name that matches the ZyXEL P-660 ADSL modem family, packed as a 959 KB RAR. The name states hardware version 2 and no firmware build number, so check the contents before use. Router firmware like this is usually loaded through the web interface, TFTP or a serial console to recover a unit that no longer boots. Confirm that the hardware version on the device label matches v2, because firmware for another revision can leave the modem unbootable.
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 →