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to ensure this file is set as the primary boot image on both active and standby supervisors.

Ensure your ROMMON version is compatible. For XE 3.11.x, you may need at least 15.0(1r)SG2 or higher (e.g., 15.1(1r)SG18) to avoid boot issues . cat4500euniversalk9spa031105e1527e5bin hot

For the network engineer, this filename is a map of capabilities and constraints. For the historian, it marks an era when monolithic IOS images began supporting modular licensing. For the security analyst, the k9 suffix signals export-controlled crypto. to ensure this file is set as the