Cisco 9300 Downgrade Boot Loader from 17.9.2r to 17.3.2r

[Sonettech1]

On a Cisco 9300 I need to Downgrade Boot Loader (ROMMON) from 17.9.2r to 17.3.2r. As a test I upgraded to IOS from 17.3.4 to 17.9.4a, as expected the Boot Loader upgraded as well with the IOS upgrade. When I upgraded the the IOS I did not initiate the rollback timer,  I have tried several procedures to to downgrade the Boot Loader and all have failed. I understand that according to Cisco "The updated ROMMON supports previous releases", nevertheless I would prefer to have the correct version of IOS go with the correct version of Boot Loader.

[Leo Laohoo]

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@Sonettech1 wrote:
On a Cisco 9300 I need to Downgrade Boot Loader (ROMMON) from 17.9.2r to 17.3.2r. 

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What is the purpose for downgrading the ROMMON to 17.3.2r?  The ROMMON has nothing to do with how the operates in the OS-level.

[Sonettech1]

Because that is what my company prefers. I was able to go back to 17.3.4 on the IOS but the ROMMON did not follow.

[Leo Laohoo]

ROMMON for routers and WLC can be manually "adjusted" but the ROMMON cannot be manually upgraded/downgraded in Catalyst 9k switches.  The ROMMON is automatically upgraded depending on the firmware used. 

If someone wants to use 17.3.4r, then downgrade to 17.3.X firmware.