: mz indicates it is a compressed file that runs from RAM.
Backing up your current configuration ( copy running-config tftp ). c1900-universalk9-mz.spa.158-3.m7.bin download
Reload:
The file is a Cisco IOS (Internetworking Operating System) software image specifically designed for the Cisco 1900 Series Integrated Services Routers (ISR) . Key Specifications Release Version : 15.8.3M7. Series : Cisco 1900 (e.g., Cisco 1941, 1921). : mz indicates it is a compressed file that runs from RAM