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?
Just ask them to rename firmware 2.8.0 as 3.3.2