C1900-universalk9-mz-spa-158-3-m7-bin |best|

The string is the filename for a Cisco IOS Software image used to update or run a Cisco 1900 series Integrated Services Router (ISR) .

Then, the magic words appeared: Cisco IOS Software, C1900 Software (C1900-UNIVERSALK9-M), Version 15.8(3)M7, RELEASE SOFTWARE (fc2) C1900-universalk9-mz-spa-158-3-m7-bin

Marcus hit Enter.