OTA configuration

I do have several Zigbee plugs (TS011F _TZ3000_xxxxx) and they do not seem to have the same firmware as only some of them are reporting power.

What is the procedure to proceed to OTA update within deCONZ?

BTW does anybody knows where to download the latest FW?

With deconz, you have a special tab for that, here you have an exemple Technical support

But from my memory the firwmare is not public.