Before upgrading, verify your router's DRAM and Flash capacity. Larger universal images often require at least 1GB to 2GB of DRAM .
This is the 8th maintenance rebuild of the 15.7(3)M release. Rebuilds typically focus on security patches and bug fixes rather than new features. Usage and Considerations C3900-universalk9-mz.spa.157-3.m8.bin
: Corrected a bug where HSRP group ID 11 failed to create a virtual MAC address ( CSCvw15842 Audio Services Before upgrading, verify your router's DRAM and Flash