The 15.7-3.m8 release is an Extended Maintenance release. Cisco splits its IOS releases into Standard Maintenance (short lifecycle for new features) and Extended Maintenance (long lifecycle focused on stability).
: Use TFTP, FTP, or SCP to copy the new file to the router's flash drive: copy tftp: flash: C2951-universalk9-mz.spa.157-3.m8.bin
Schedule maintenance window; notify stakeholders. The 15