C3900-universalk9-mz.spa.157-3.m8.bin [verified]

The universalk9 image contains both export-controlled encryption and "low crypto" code. However, activation of high-security features (like 3DES/AES 256) requires a separate security license (FLASEC-K9). Simply downloading the .bin file does not unlock VPN throughput; you must install a license via the license install command.

license install flash:FLASEC-K9-3945.lic C3900-universalk9-mz.spa.157-3.m8.bin

Cisco routers require two types of memory: Flash (storage) and DRAM (running memory). C3900-universalk9-mz.spa.157-3.m8.bin

Check the Cisco Feature Navigator to ensure your specific hardware modules are supported in this release. C3900-universalk9-mz.spa.157-3.m8.bin