: The 15.7(3)M release reached its end-of-sale milestone on November 10, 2020 . Installation & Deployment
This is the 8th maintenance release of the 15.7(3)M train, which is typically used for long-term stability. C3900-universalk9-mz.spa.157-3.m8.bin
The file is a Cisco IOS software image designed for the Cisco 3900 Series Integrated Services Routers (ISR G2) , specifically models like the Cisco 3925 and 3945. Feature Overview : The 15
value. It was a perfect match. A single bit out of place could have turned his $10,000 router into a very heavy, expensive paperweight. The Reboot 000 router into a very heavy