AP100C not recognized on UTM9

Tried to ping that IP?

Because the AP100 has no Reset Button you can try to have a look at this: https://support.sophos.com/support/s/article/KBA-000007246?language=en_US

Yes I can Ping the IP address just fine.  I will look at the link provided.

and the AP is attached to an interface allowed for wlan? You still have a working wlan with other APs running?

So then try the attached link for revive it.

Are the Firmware images in the car file, or are they separately downloaded?

Yes, I have 2 AP100 that are working, it is just the ap100C that is giving me a fit.  I think the link will change the attitude on the AP100C.

I appreciate the assistance.