Router# show license feature Router# show license udi
Save your running runtime configurations and transfer them to an external storage server for disaster recovery purposes:
Ensure the router is on a stable power source (UPS); a power failure during a flash write can lead to ROMMON recovery. Use code with caution. Copied to clipboard 5. Verification Once the router is back online, confirm the version: show version c800universalk9mzspa1593m10bin install
show bootvar # Expected: BOOT variable = flash:c800universalk9mzspa159-3.M10.bin # Configuration register = 0x2102
Provide the commands to and delete old files . Router# show license feature Router# show license udi
This indicates the boot path variable was misconfigured or the image was corrupted. You can boot manually from ROMMON by typing boot flash:c800-universalk9-mz.SPA.159-3.M10.bin . If you are running into issues with your upgrade, tell me: What is the exact error message or symbol sequence you see? Which router model (e.g., C841M, C891F) are you using? How much free flash space is showing on your device?
Cisco ISR 800 Series IOS Upgrade Guide: Installing c800-universalk9-mz.SPA.159-3.M10.bin Verification Once the router is back online, confirm
......................................................................Done! verify /md5 (flash:c800-universalk9-mz.SPA.159-3.M10.bin) = 9a7e6b5c4d3e2f1a0b9c8d7e6f5a4b3c Use code with caution.