Additionally, this image support:
You should this image if:
Verify the file integrity: verify /md5 flash:c3900-universalk9-mz.SPA.157-3.M8.bin C3900-universalk9-mz.spa.157-3.m8.bin
Built for the Cisco 3900 series, which includes the 3925 and 3945 routers. Additionally, this image support: You should this image