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Router# copy tftp://10.1.1.50/asr1000-rommon.173-1r.spa.pkg bootflash: Use code with caution. Step 3: MD5 Hash Verification

If you are performing maintenance on a Cisco ASR 1000 Series router, you may have come across the file in your downloads or during a consolidated package upgrade.

Look closely at the output for the listed under your respective Route Processor slot. If it is running an older version (e.g., 16.x or an earlier 15.x build), an upgrade is necessary to transition to modern Cisco IOS XE software. Step-by-Step Upgrade Procedure

Engineers should be aware that after completing the ROMMON upgrade, the router must be reloaded to make the new ROMMON permanent. The upgrade process flashes the ROMON, repartitions the flash memory, and rewrites the necessary components.

Once upgraded to version 17.3(1r) , the router cannot be downgraded to any earlier ROMmon version.

It initializes hardware components, runs diagnostics, and loads the main IOS XE image into memory.

of the router or specific hardware module (RP, ESP, or SIP) to take effect. Cisco Community Important Considerations ASR1002-RP1 ROMmon upgrade 17.3(1r) stuck - Cisco Community

Experts recommend upgrading the ROMmon first, but do not reboot until you have also unpacked the new IOS XE .bin file and updated your boot variables to packages.conf .