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: Ensure your router has sufficient DRAM and Flash memory. Release 15.8(3)M typically requires 512 MB DRAM 256 MB Flash for 1900 series devices. Feature Support

Cisco IOS Software: C1900-UNIVERSALK9-MZ.SPA.158-3.M7.BIN Overview c1900-universalk9-mz.spa.158-3.m7.bin download

– Universal image with full feature set, including cryptographic (K9) capabilities. : Ensure your router has sufficient DRAM and Flash memory