After Successful pairing and Renaming the device it does not connect to wifi and Green light keeps blinking, tried to delete and repair but no luck.
One device is connecting and another - Does not.... :(
I had the same problem.
I changed router and could not reconnect six sonoff switches.
The solution for me was by trial and error, here’s what I found out and how I sorted it.
Switches connected to a network have to be deleted from that network before they can be connected to a new one. It is no good just deleting them from the app, they have to be connected to the app when deleted. If not they are constantly trying to reconnect when they are repowered and will not recognise a new router trying to connect them. They have to be told to forget the old network.
Let me give you a quick rundown of how these things connect.
You have your phone with ewelink connected to your wifi. When you try to pair, the phone with ewelink disconnects from your wifi and goes off looking for a new switch, it then connects to that switch directly over the switches own wifi link, not the one you were on, and you will see device found and registering in the app. It then reconnects the phone with ewelink back to your wifi. The switch should then follow and connect as well.
The problem is that if the switch has not previously been deleted, it will try to connect to the network it was previously on that no longer exists, not the one you are on. And it will show on your phone as offline. But the app will show it as a new device because they talked to each other directly, not via your wifi network. (Watch the wifi symbol on your phone when you do it, it will go on and off three times) The switch has never connected to your wifi network, it has only talked to the phone with the app on direct.
Trying to delete the switches old network cannot be done by trying to over right it with a new one. The old network has to be deleted via the app first, whilst connected to it. The switch has to be network free before it can be connected.
The other problem is that the new app hates 5G, even though the switches only use 2.4G.
My solution was as follows.
1, deactivate the 5G wifi transmittion on your router.
2, enable the guest network with a password and WPA-PSK [TKIP] security, yes I know TKIP is not as good but it is only temporary.
3, go to your phones wifi settings and forget all the networks in range, especially any 5G ones and the normal 2.4G ones that you have been using. (This is to stop your phone reconnecting to them with a saved password halfway through the pairing process, because your phone will prefer them over a guest network)
4, connect to the guest network and tick save the password.
5, open the ewelink app and hit the + button.
6, on the switch, press the pair button for 7 seconds twice to get it to flash at a constant fast rate, Blink blink bink, not blink blink bliiiiiink.
7, pair using the normal quick pair mode. If this doesn’t work do it again with AP mode, but the switch needs to be flashing fast for both types.
8, if all is well you should have a connected online switch. Give it a test.
9, If it’s working you need to delete it from the app to get it to connect with your normal 2.4G network. So it’s best to get all your switches working on the guest network first and test them.
10, Delete all the switches from the app whilst they are connected, and you should see the steady light on the switches start to flash.
11, Now go to your router and disable the guest network, and reconnect your phone to the normal network and tick save the password. This should be the only network in range with a saved password.
12, now re pair all your switches again to the app on your normal network. If it won’t connect to them temporarily set the security on your normal network to TKIP. Once they have paired you can return your security to how you normally have it and re enable your 5G network as well.
I have written this whilst I have been doing it myself, it does work. It may also help if you check and update the switches firmware whilst they are connected to your guest network, as the latest app version is a bit finicky about that as well.
All of my switches are in my barn, and I have managed to get them working on a Netgear router connected to my barn by three Netgear wifi extenders in a line. So my phone in the house is connected to network name Netgear, and my switches are connected to network Netgear EXT<EXT<EXT. and they all work with Alexa as well. So I know this solution works.
Hope it help you.
I forgot to add it to my post above or below. But a copy of the old app can be found here.
This is the one with the bar progress indicator instead of the numerical timer. It works better with old software switches and lets you update them for better connection to the new app.
They call it a fix tool but it's just the old app.
I have a ASUS RT-AC88U The solution was pretty simple:
Never use same password in 5GHZ and 2.4GHZ band
use different passwords for the two bands
I don't understand this behavior, but for me this solution was very well
after change this i try connect devices with success, I has using the same encryption type for both bands
I hope that ITEAD fix this problem in the next firmware update if its is possible.