Successful Cisco ISR4331 Router Firmware Upgrade 24 Feb 2025 Monday - Need to break into ROMMON first

Subject: Successful Cisco ISR4331 Router Firmware Upgrade 24 Feb 2025 Monday - Need to break into ROMMON first


Good day from Singapore,


Please refer to Part 1 for the background first before continuing.


Part 1: Cisco ISR4331 Router Firmware Upgrade Failure 21 Feb 2025 Friday


Links:

https://puck.nether.net/pipermail/cisco-nsp/2025-February/109136.html

https://lists.freebsd.org/archives/freebsd-chat/2025-February/000048.html


The reason the firmware upgrade failed on 21 Feb 2025 Friday is because the existing ROMMON is too old. It could not support the latest firmware version. You need to upgrade the ROMMON too. It can be done automatically by the latest firmware.


But first, you need to break into ROMMON.


[QUOTE]


Hi,


complete these steps to simulate a break key sequence to enter the rommon:


1.Connect to the router with these terminal settings:


1200 baud rate


No parity


8 data bits


1 stop bit


No flow control


You no longer see any output on your screen, and this is normal.


2.Power cycle (switch off and then on) the switch and press the SPACEBAR for 10-15 seconds in order to generate a signal similar to the break sequence.


3.Disconnect your terminal, and reconnect with a 9600 baud rate. You enter the ROM Monitor mode.


HTH,


Mohammed Mahmoud.


[/QUOTE]


Link: https://community.cisco.com/t5/switching/ctrl-break-doesn-t-work-cannot-boot-on-rommon/td-p/774165


Then you need to configure the old ROMMON to boot from the latest firmware.


rommon 1 > set BOOT=bootflash:isr4300-universalk9.17.12.04a.SPA.bin

rommon 2 > sync

rommon 3 > sync

rommon 4 > set

PS1=rommon ! >

ETHER_SPEED_MODE=4

TFTP_BLKSIZE=512

MCP_STARTUP_TRACEFLAGS=00000000:00000000

LICENSE_SUITE=

LICENSE_BOOT_LEVEL=

THRPUT=100000

BSI=0

RANDOM_NUM=1300654495

RET_2_RTS=19:28:49 SGT Fri Feb 21 2025

RET_2_RCALTS=1740137329

DEVICE_MANAGED_MODE=autonomous

BOOT=bootflash:isr4300-universalk9.17.12.04a.SPA.bin

rommon 5 > reset


Resetting .......


Initializing Hardware ...


Located isr4300-universalk9.17.12.04a.SPA.bin


Feb 24 04:51:28.531: %BOOT-5-OPMODE_LOG: R0/0: binos: System booted in AUTONOMOUS mode

Detected old ROMMON version 16.7(3r), upgrade required

Upgrading to newer ROMMON version required by this version of IOS-XE, do not power cycle the system.  A reboot will automatically occur for the new ROMMON to take effect.

Booted : 0

Selected : 0

Reset Reason: 0

Switching to ROM 1

Upgrading ROMMON image...

Verifying ROMMON image...

Switching back to ROM 0

ROMMON upgrade was successful...

Copying ROMMON environment...

Switching to ROM 1

Updating ROMMON environment...


ROMMON Variable data passed verification check (1).

Switching back to ROM 0

ROMMON upgrade complete.

To make the new ROMMON permanent, you must restart the RP.

ROMMON upgrade successful.  Rebooting for upgrade to take effect.


Initializing Hardware ...


System Bootstrap, Version 16.7(3r), RELEASE SOFTWARE

Copyright (c) 1994-2017  by cisco Systems, Inc.



Current image running: Boot ROM0


Last reset cause: LocalSoft

ISR4331/K9 platform with 4194304 Kbytes of main memory


Rommon upgrade requested

Flash upgrade reset 1 in progress


Initializing Hardware ...


Checking for PCIe device presence...done

System integrity status: 0x300610

Rom image verified correctly



System Bootstrap, Version 16.12(2r), RELEASE SOFTWARE

Copyright (c) 1994-2019  by cisco Systems, Inc.



Current image running: *Upgrade in progress* Boot ROM1


Last reset cause: BootRomUpgrade

ISR4331/K9 platform with 4194304 Kbytes of main memory



........

Located isr4300-universalk9.17.12.04a.SPA.bin


Cisco IOS Software [Dublin], ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 17.12.4a, RELEASE SOFTWARE (fc2)

Technical Support: http://www.cisco.com/techsupport

Copyright (c) 1986-2024 by Cisco Systems, Inc.

Compiled Sun 15-Dec-24 00:27 by mcpre


cisco ISR4331/K9 (1RU) processor with 1638523K/3071K bytes of memory.

Processor board ID 

Router operating mode: Autonomous

3 Gigabit Ethernet interfaces

32768K bytes of non-volatile configuration memory.

4194304K bytes of physical memory.

3125247K bytes of flash memory at bootflash:.

 



Press RETURN to get started!


Router>


SUCCESS! I have successfully upgraded the firmware of my Cisco ISR4331 router from version 3.16.10.S.155-3.S10-ext to version 17.12.4a.


Regards,


Mr. Turritopsis Dohrnii Teo En Ming

Targeted Individuals in Singapore

GIMP = Government-Induced Medical Problems

24 Feb 2025 Monday

9.28 PM Singapore Time





REFERENCES

===============


[1] https://puck.nether.net/pipermail/cisco-nsp/2025-February/109137.html


[2] https://www.mail-archive.com/cisco-nsp@puck.nether.net/msg69405.html


[3] https://marc.info/?l=cisco-nsp&m=174040362512862&w=2

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