X60 as main router and deco M5 as satellite

@KevinV 

I believe you are asking how to set the Deco to AES? If so, you go into your wireless settings and tap on your password. There will be an option there for AES only. If not, check if the firmware is up to date. If so, swap the x60 with the M5 to make the M5 the main Deco, and check the firmware update again.