Guidance on Resetting a 9120 Access Point Without Losing the AP Image

[vinitgori1]

Hello Team,

Could you please advise on how to reset a 9120 access point so that it forgets the known WLC list only? I should not lose AP image.

Scenario:
My 9120 AP is attempting to join the 5520 WLC through option 43, which is not compatible. I have updated the option 43 setting for the 9120 AP to the IP of the 9800 WLC, but it is still sending a join request to the 5520 WLC.

I would like to physically reset the access point to clear its known WLC IP list without losing the AP image. Based on my research, holding the reset button for 20 seconds performs a regular reset, while holding it for 30 seconds initiates a full factory reset.
Could you confirm which method I should use to reset the AP without losing the image?

[vinitgori1]

Hello All,

After clearing the lease, appling the option 43 again from scratch and restarting the DHCP services, the AP joined the WLC.
It seems that option 43 was not taken by AP the first time. A DHCP service restart was required after the modification.
The first AP lucky took the option 43 without the DHCP service restart it seems.

Still physical AP factory reset is not clear for new models

These new model APs donot have console cli access to run any command. You can take only cli access via SSH once they have joined the WLC.
Thank you all for your help