I bought 6 sonoff devices and I tried upgrading to 3.3.0 on one device. The energy monitor most of the time doesn't work. It's like stuck to 0 Watt or whatever the last number is there. Sometimes it just drops to 0 Watt even when the AC is working.
I'm not upgrading the other devices. How can I revert to previous firmware to fix this?
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Do you really want to try this? I think its not possible. However, i didn't use any sonof device yet but its look interesting.