Confirm this work on the latest 1.5.4. Except after step 7 I continued to fight one more time and collect reward then it pops up. This is useful if you purchased the app, but your phone dont have root. I used Blue Stack and then sync my cloud data from BS to phone. Might have to uninstall your game and reinstall for the cloud data to show up. I also didnt restart the game, it actually work if I dont. At least on my phone it does.