The ROMMON upgrade process, while generally straightforward using the upgrade rom-monitor filename command, requires patience and potentially multiple reload cycles to complete successfully. When issues arise, the Cisco support community and bug search tools provide valuable troubleshooting resources for resolving upgrade failures and compatibility problems.
If you have the .pkg file on your bootflash and need to force an upgrade (for example, during a disaster recovery where the ROMMON is corrupted), you would typically use the upgrade rom-monitor command in privileged exec mode, pointing to the specific package file.
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However, if you need to manually verify or upgrade, here is the workflow: asr1000-rommon.173-1r.spa.pkg
The ROMMON is the lowest-level code on your ASR 1000 router. It runs before the Cisco IOS XE software starts.
(e.g., new ESP or RP modules). 3. Preparation Before Upgrading
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ROMMON version: System Bootstrap, Version 17.3(1r), RELEASE SOFTWARE
%ROMMON-IMG-INVALID: Image checksum failed %ROMMON-BOOT-FAIL: No valid boot image, falling back to rommon
if the router reaches rommon# but no images boot: Step 1: Verification and Backup
File size is 0x02728430 Located asr1000-rommon.173-1r.SPA.pkg Image size 41059376 inode num 11, bks cnt 10025 blk size 8*512 ##### Cisco Community
The output will display the current system bootstrap version. If it is already Version 17.3(1r) , the upgrade is not required. For a single form-factor platform like the ASR 1001-X, the command show rom-monitor R0 can be used.
The upgrade is until the hardware is reloaded.
Upgrading the ROMMON firmware requires careful execution to avoid bricking the system hardware. Step 1: Verification and Backup