/root/Downloads/FW_WRT1900AC_1.1.8.164461_prod.img: u-boot legacy uImage, Linux-3.2.40, Linux/ARM, OS Kernel Image (Not compressed), 3856080 bytes, Thu Nov 20 13:45:36 2014, Load Address: 0x00008000, Entry Point: 0x00008000, Header CRC: 0x5CAE7F84, Data CRC: 0xFCF78543

Disk /root/Downloads/FW_WRT1900AC_1.1.8.164461_prod.img: 26 MB, 26345472 bytes
255 heads, 63 sectors/track, 3 cylinders, total 51456 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x80811005

Disk /root/Downloads/FW_WRT1900AC_1.1.8.164461_prod.img doesn't contain a valid partition table