ROMMON version for ISR 4331 Router

[firdauskhambatta]

Hello experts !!
I recently got a used ISR 4331 and I am trying to upgrade the ROMMON. The latest version of ROMMON on Cisco's portal is Release 16.12(2r). However when I type the "show platform" command on my router. It displays that it's R0 version is 17.6.2 
I dont understand the logic, how did the router have a higher version of ROMMON installed, when the latest running version by cisco is still 16.12(2r). 
What am I missing here. 
Thanks a lot to whoever is going to answer

[marce1000]

 - Post the particular output you are referring to from the show command , include lines above and below too , 

 M.

[firdauskhambatta]

This is the output of the "show platform" command. My apologies, but i believe I already posted the output as attached files, I'll copy/paste next time. Thanks again.

Router#sh platform
Chassis type: ISR4331/K9

Slot Type State Insert time (ago)
--------- ------------------- --------------------- -----------------
0 ISR4331/K9 ok 2d20h
0/0 ISR4331-3x1GE ok 2d20h
0/1 NIM-2FXS/4FXOP ok 2d20h
0/2 NIM-ES2-4 ok 2d20h
0/4 PVDM4-32 ok 2d20h
1 ISR4331/K9 ok 2d20h
R0 ISR4331/K9 ok, active 2d20h
F0 ISR4331/K9 ok, active 2d20h
P0 PWR-4330-AC ok 2d20h
P2 ACS-4330-FANASSY ok 2d20h

Slot CPLD Version Firmware Version
--------- ------------------- ---------------------------------------
0 19040541 17.6.2
1 19040541 17.6.2
R0 19040541 17.6.2
F0 19040541 17.6.2

[balaji.bandi]

Looks some one might have already upgraded to latest and downgraded IOS code,.

when you downgrade IOS code, the ROMMON will not downgrade.

[firdauskhambatta]

I unerstand, thanks. But I am still curious about the part that on Cisco's portal the highest version for ROMMON is 16.12(2r)
But in the show platform, its shows version 17.6.2
OR is it that when someone upgraded the IOS version to 17.6.2, the ROMMON took that number to display in its output ?
Hope i make sense
Thanks 

[balaji.bandi]

post show version (complete with out changing to give you right answer)

[firdauskhambatta]

Hello Balaji, 
here's the output and thanks again 

Router#sh version
Cisco IOS XE Software, Version 16.06.04
Cisco IOS Software [Everest], ISR Software (X86_64_LINUX_IOSD-UNIVERSALK9-M), Version 16.6.4, RELEASE SOFTWARE (fc3)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2018 by Cisco Systems, Inc.
Compiled Sun 08-Jul-18 04:33 by mcpre

Cisco IOS-XE software, Copyright (c) 2005-2018 by cisco Systems, Inc.
All rights reserved. Certain components of Cisco IOS-XE software are
licensed under the GNU General Public License ("GPL") Version 2.0. The
software code licensed under GPL Version 2.0 is free software that comes
with ABSOLUTELY NO WARRANTY. You can redistribute and/or modify such
GPL code under the terms of GPL Version 2.0. For more details, see the
documentation or "License Notice" file accompanying the IOS-XE software,
or the applicable URL provided on the flyer accompanying the IOS-XE
software.

ROM: IOS-XE ROMMON

Router uptime is 5 minutes
Uptime for this control processor is 8 minutes
System returned to ROM by Reload Command
System image file is "bootflash:isr4300-universalk9.16.06.04.SPA.bin"
Last reload reason: Reload Command

This product contains cryptographic features and is subject to United
States and local country laws governing import, export, transfer and
use. Delivery of Cisco cryptographic products does not imply
third-party authority to import, export, distribute or use encryption.
Importers, exporters, distributors and users are responsible for
compliance with U.S. and local country laws. By using this product you
agree to comply with applicable laws and regulations. If you are unable
to comply with U.S. and local laws, return this product immediately.

A summary of U.S. laws governing Cisco cryptographic products may be found at:
http://www.cisco.com/wwl/export/crypto/tool/stqrg.html

If you require further assistance please contact us by sending email to
export@cisco.com.

Suite License Information for Module:'esg'

--------------------------------------------------------------------------------
Suite Suite Current Type Suite Next reboot
--------------------------------------------------------------------------------
FoundationSuiteK9 None None None
securityk9
appxk9

AdvUCSuiteK9 None None None
uck9
cme-srst
cube

Technology Package License Information:

-----------------------------------------------------------------
Technology Technology-package Technology-package
Current Type Next reboot
------------------------------------------------------------------
appxk9 None None None
uck9 uck9 Permanent uck9
securityk9 None None None
ipbase ipbasek9 Permanent ipbasek9

cisco ISR4331/K9 (1RU) processor with 1795999K/6147K bytes of memory.
Processor board ID FLM261811FA
1 Virtual Ethernet interface
7 Gigabit Ethernet interfaces
4 Voice FXO interfaces
2 Voice FXS interfaces
32768K bytes of non-volatile configuration memory.
4194304K bytes of physical memory.
3207167K bytes of flash memory at bootflash:.
1996668K bytes of USB flash at usb0:.
0K bytes of WebUI ODM Files at webui:.

Configuration register is 0x2102

[balaji.bandi]

Look at the show version the device might have shipped with the new ROMMON, this is common on cisco devices.

[firdauskhambatta]

Thanks Balaji 

[marce1000]

 - Also post output of :  show rom-monitor

 M.

[firdauskhambatta]

#sh rom-monitor r0

System Bootstrap, Version 17.6.2, RELEASE SOFTWARE
Copyright (c) 1994-2021 by cisco Systems, Inc.

[marce1000]

 - It it inconsistent with what is offered as being available for download , as other poster said perhaps due to upgrade ,finally verify with show tech-support output and check if there are any references in there concerning the rommon version , 

 M.

[Joseph W. Doherty · Accepted solution]

It's possible a device has a newer ROMMOM to support some hardware chip changes in a new production series of some device, but prior production series, of the same device series don't need that ROMMOM, so it's not posted for field updates.  I.e. all the devices that should have the newer ROMMON have it, and older devices don't need it.

[firdauskhambatta]

Thanks for the reply, what you said makes sense to me. 

[Leo Laohoo]

Don't worry about the ROMMON.  That version was probably factory-installed.