C3620-a3jk8s-mz.122-26c.image //free\\ May 2026

Here's a breakdown of what that filename typically means (Cisco IOS naming convention):

c3620-a3jk8s-mz.122-26c.image

It looks like you want to similar to the pattern: c3620-a3jk8s-mz.122-26c.image