RAR archive of 1003 KB with firmware for the P-660RU-T1 hardware version 3, a Zyxel Prestige ADSL modem with USB interface. The name carries no firmware build number, so check the file inside before flashing. Such firmware is used to restore modems with corrupted software via the web upgrade page or recovery mode in the bootloader. Make sure the label reads v3 rather than v3s or v2, because images for other revisions may brick the unit, and save the existing firmware or configuration beforehand.
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 →