Our 5 Sonoff switches are all connected and online to our router but the firmeware upgrade allways fails - what can be done?
- Uninstall the laest ewelink version.
- Install the oficial version of ewelink that you find in play/appstore.
- Start the app and NO upgrade in this moment.
- Now you can update the firmware device and when the work finish, you can upgrade the app too.
I hope I've helped.
I hope the next one helps for You all!
After 6 hours, spent trying to upgrage from 1.2 to 1.5 without any result - it stopped upgrading at 90% and said - it failed (I switched off alternative WIFI, pushed every possible buttons in every possible ways, renamed device, upgraded, removed and installed eWeLink again...etc )
At the end I simply removed/deleted the device from my eWeLink app (android), added/paired the device again and...pushed upgrade, and it was upgraded at once - tadaa!
That's all I think...
Good luck! :)
@toncsi King , tried that as well. this is for 1.5 -> 1.8 and no joy; on the S20 :(