Upgrade 1562i acting as a WLC

[key_tone_9926]

I have several cisco AP1562i AP's one of them is also acting as a AP and as the WLC for al the AP's. 

They are all running 8.3.122.0 and I wanted to know how would I go about trying to upgrade them all. I read that I would need to upgrade the WLC, then that would upgrade the AP's but on the GUI there is no option to upgrade the  WLC. 

Would I have to upgrade the WLC via the cli only.

Many Thanks

In advanced

[patoberli]

Here you go:
https://www.cisco.com/c/en/us/td/docs/wireless/controller/technotes/8-3/b_Cisco_Mobility_Express_Deployment_Guide/b_Cisco_Mobility_Express_Deployment_Guide_chapter_0111.html#id_31492
I suggest you upgrade till you reach 8.5.151.0.