Being a "mz" (compressed in RAM) image, it requires significant DRAM. You should verify your 2951 has at least 512MB to 1GB of DRAM 256MB of Flash
The router began to pull in the new image. This was a digital heart transplant. The file C2951-universalk9-mz.spa.157-3.m8.bin
The file is a specific Cisco IOS software image designed for the Cisco 2951 Integrated Services Router (ISR) . It represents a highly stable, "Extended Maintenance" release from the 15.7(3)M train, featuring the most comprehensive security and feature set available for this platform. What the Name Tells You Being a "mz" (compressed in RAM) image, it
