Cisco WLC 9800 CL firmware downgrade

[Cheah Lit Thor]

Hi Expert,

I'm using WLC 9800 CL and i recently downgrade the firmware from 17.5.1 to 17.3.3 due to some voice traffic keep having call quality issue, after i downgrade the firmware to 17.3.3 solve my problem then i found after few days(not sure exactly when it happened) the WLC firmware automatically revert back to 17.5.1, may i know why it behave like this?

Before i downgrade the firmware to 17.3.3 i did deleted the unused files in the flash and only did the downgrade.

Appreciate some one can share with me any step i miss out ?

[Arshad Safrulla]

Is you IOS-XE installed in install mode or bundle mode?

Please post the output for the below

• show run | include boot
• show boot
• dir

[Cheah Lit Thor]

Once i get the output then will send it here Thanks.

[Leo Laohoo]

Is there a DNAC appliance?

[Cheah Lit Thor]

Nope just vWLC it self alone.Thanks

[Rasika Nayanajith · Accepted solution]

I hope you did it via GUI.

Did you commit your changes after the downgrade? if not it may roll back to previous firmware versions (with default 6-8hr auto abort).

Here is the CLI command to run once you upload the image to flash (assuming 17.3.4 is the code)

c9800#install add file bootflash:C9800-CL-universalk9.17.03.04.SPA.bin activate commit

HTH

Rasika

*** Pls rate all useful responses ***

[Cheah Lit Thor]

Yes i did it via GUI, am i still need to commit it after the upgrade although using GUI?

Thanks

[Rasika Nayanajith]

Yes, usually once 9800 reload, you will have to go there & commit your upgrade via GUI. Otherwise, it will roll back after timer expires (i think 6hr by default)

Rasika

[Cheah Lit Thor]

Hi,

Do you mean after I'm upload and install the new firmware through GUI then it will reboot, after it come back then i have to go to the software management to click commit?

Thanks

[Rasika Nayanajith · Accepted solution]

Yes, that is the way.

[Leo Laohoo]

Please post the complete output to the command "sh log on uptime".