Sonoff device firmware update with SonOff LAn

I am at a complete loss and have read and scoured the internet and I still don’t know how to do this

I have a couple of dozen sonoff devices and want to make sure the firmware is updated. Can someone please tell me how to do that? In the ewelink app. It was simple but I’m trying to get everything moved off the cloud and do away with ewelink

Thanks on advance