The filename asr1000-rommon.173-1r.SPA.pkg is structured to provide specific information at a glance:
(ROM Monitor) is the bootstrap firmware embedded on the motherboard of Cisco routers and switches. When you power on an ASR1000, the CPU has no memory, no routing protocols, and no interfaces active. The first code to execute resides in a small ROM chip. That code is ROMMON.
Early ASR 1000 units had 4GB bootflash. Modern IOS XE images easily exceed 1GB, and 173-1r improved the ROMMON’s file system driver to handle 8GB, 16GB, and even 32GB USB drives for recovery. asr1000-rommon.173-1r.spa.pkg
Route Processor 2 (RP2) and Route Processor 3 (RP3) engines installed in modular chassis (ASR 1004, 1006, 1006-X, 1009-X, 1013) System Verification
Always compare against Cisco’s published value. The filename asr1000-rommon
You rarely need to extract and install asr1000-rommon.173-1r.spa.pkg manually. The standard procedure is bundled installation.
After boot, re-run:
reload location all
Next-generation fixed chassis platforms. That code is ROMMON
(example SHA256):