If you only need to update the router, look for the .bin firmware file on the official ZyXEL Support Site [1], which is designed for standard web interface upgrades.
Provides a complete binary copy of the router's flash memory, including the bootloader, kernel, and filesystem. Download ZYXEL P6601HN Dump rar
Based on your request, it seems you are looking to download a firmware dump or configuration file for a ZyXEL P-660HN series router Go to product viewer dialog for this item. If you only need to update the router, look for the
Note that .rar is an archive format; you will likely need software like WinRAR or 7-Zip to extract the actual firmware files inside. Note that
Allows users to restore a "bricked" router that will no longer boot by flashing the dump directly to the chip via JTAG or UART interfaces.