Save your current running configuration ( copy running-config startup-config ) and back up your current IOS image from flash to your external server just in case a rollback is required.
Cisco IOS filenames contain dense information regarding compatibility, features, encryption capabilities, and versioning. Decoding c1900-universalk9-mz.SPA.158-3.M7.bin reveals the following specifications: c1900-universalk9-mz.spa.158-3.m7.bin download
Instruct the system hardware bootstrap to look for the newly imported file path first on subsequent power cycles: c1900-universalk9-mz.spa.158-3.m7.bin download
Use the or search by your hardware model (e.g., Cisco 1941 Integrated Services Router ). Select Cisco IOS Software as the software type. c1900-universalk9-mz.spa.158-3.m7.bin download