Upgrade ISR 4331

[mdrangell22]

Hello

I neeed to upgrade 4331 from 16.6.9 with rommon 16.7(3r) to last ios versión 17.12.4a but I am not completed sure with the procederé...

I think is the following

1. Upgrade Rommon to 16.12(2r)

2. Upgrade IOS to 17.12.4a

Is this good? The licenses Will convert un Smart Automatically right adm keep being permanente?

[M02@rt37]

Hello @mdrangell22 

A direct upgrade from 16.6.x to 17.x.x is possible and may need a ROMMON upgrade.

Please follow @Leo Laohoo procedure: https://community.cisco.com/t5/networking-knowledge-base/cisco-isr-amp-asr-1k-routers-ios-xe-firmware-upgrade-install/ta-p/4426457

[Joshqun Ismayilov]

Hi @mdrangell22 

Please check : https://community.cisco.com/t5/routing/isr-4331-upgrade-from-16-6-x-to-17-3-4a-universalk9-no-sd-wan/td-p/4472452


Regards,
Joshuqn Ismayiov

[Leo Laohoo]

1.  ROMMON upgrade mandatory.  Failure to upgrade the ROMMON will cause the router to go into a boot-crash-loop. 

2.  It is NOT POSSIBLE to upgrade directly, from 16.X.X, to 17.12.X without going through an intermediate version like 17.6.X or 17.9.X.  (NOTE:  This information is not freely available to anyone.)  Failure to heed this warning will cause the router to go into a boot-crash-loop.