If you meant “I need a feature” as in:
While is not a standard public keyword, this deep-dive analysis shows how such a string can be deconstructed into potential hardware platform, IOS version, filename component, and binary type — with the highest likelihood being a Cisco 3660 router running a custom or mislabeled IOS 12.4(25d) image . C3660 A3jk9s Mz 124 25d Bin