: Visit the Cisco Bug Search Tool and search for NCSW10301 or specific error keywords. Review the details and see if any known bug matches your symptoms (although no public bug was found in our search). A known bug, CSCwc32584 , for a Firepower platform highlights that software upgrade failures due to "Image download failure... Image being downloaded is not supported by this platform" can occur, showing the value of checking specific bugs.
After analyzing various reports and Cisco community discussions, we've identified some potential causes of the NCSW10301 error: : Visit the Cisco Bug Search Tool and
Enter the explicit file path pointing to your internal staging server (e.g., sftp://10.0.X.X/images/cat9k_iosxe.bin ). the issue is network-related.
If you get a certificate error or timeout, the issue is network-related. : Visit the Cisco Bug Search Tool and