Asr1000-rommon.173-1r.spa.pkg Jun 2026

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

The is a specialized firmware package used to update the ROM Monitor (ROMMON) on Cisco ASR 1000 Series Aggregation Services Routers . As a critical low-level bootstrap, ROMMON is responsible for initializing the router's hardware and loading the Cisco IOS XE software . asr1000-rommon.173-1r.spa.pkg

When an ASR 1000 router powers on or reboots, the ROMMON code executes first. It performs the following essential tasks: Once upgraded to version 17

(Integrated fixed-chassis routers) Cisco ASR 1001-HX and ASR 1002-HX Once upgraded to version 17.3(1r)

ROMMON upgrade is . A failed upgrade (power loss during write, bad file, wrong hardware) leaves the RP in a non-bootable state.