It is not possible to downgrade ROMMON from isr4200_4300_rommon_169_1r_SPA.pkg TO isr4200_4300_rommon_167_5r_SPA.pkg

[millanbelsue]

It is not possible to downgrade ROMMON from isr4200_4300_rommon_169_1r_SPA.pkg TO isr4200_4300_rommon_167_5r_SPA.pkg in a CISCO 4331

I have tried with IOS:

- isr4300-universalk9.03.16.07.S.155-3.S7-ext.SPA.bin

- isr4300-universalk9.03.16.07.S.155-3.S8-ext.SPA.bin

- isr4300-universalk9.16.09.04.SPA.bin

The CPLD version is 17100927 (16.7.2)

Anyone know how to do it?

[Leo Laohoo]

Why would anyone want to downgrade ROMMON version?

[millanbelsue]

We want to use the recommended ROMMON version specified in the Release Note of the isr4300-universalk9.16.09.04

[Leo Laohoo · Accepted solution]

Recommended ROMMON version?
Let me put it this way, if the router is already loaded with 16.9(1r), the ROMMON should be UPGRADED to 16.9(2r) in order to fix CSCvr18589.

[sbutler44]

Downgrading ROMmon would be handing a lab / learning situations. 

I recently purchase 2x Routers for CCNA learning, and unfortunately, both have already had their ROMmon upgraded to the latest version.