Wait. The router will extract the image (the mz compression). This takes 2 minutes. If you see System returned to ROM by... and the prompt returns, you are successful.
: Represents the Cisco IOS version—15.7(3) Maintenance Release 8. bin : The file extension for the binary image. c2951universalk9mzspa1573m8bin updated
While maintenance releases like M8 provided extended life, the End-of-Life Announcement for Cisco IOS 15.7 specifies that vulnerability and security support for this train is nearing its final phases. If you see System returned to ROM by
Improved support for older EHWIC cards and DSP (Digital Signal Processor) resources. Installation and Upgrade Guide bin : The file extension for the binary image
Router# copy tftp: flash: Address or name of remote host []? 192.168.1.50 Source filename []? c2951-universalk9-mz.SPA.157-3.M8.bin Destination filename [c2951-universalk9-mz.SPA.157-3.M8.bin]? Use code with caution. Step 3: Modify the Boot System Variable