Keep at least one known-good image on flash for emergencies.
Do not attempt the upgrade until you complete the following steps: Verify Available Memory and Storage c800universalk9mzspa1593m10bin install
How to Install Cisco IOS Release 15.9(3)M10 on Cisco C800 Series Routers Keep at least one known-good image on flash for emergencies
copy running-config startup-config copy running-config tftp:// /config-backup.txt Use code with caution. Copied to clipboard Run a Message Digest 5 (MD5) hash validation
Corrupted file transfers can brick your router. Run a Message Digest 5 (MD5) hash validation against the file in flash memory:
Upgrading the IOS on your Cisco 800 Series ISR (Integrated Services Router) is a critical task for maintaining security and gaining access to the latest networking features. The image c800-universalk9-mz.SPA.159-3.M10.bin represents a stable release in the 15.9(3)M train.
The platform generally requires at least 512 MB to 1 GB of system memory to load and run 15.9M mainline trains smoothly. Backup Existing Assets