To transfer your progress between Android and iOS devices, follow these steps:
Connect your main game progress to Nekki ID. Go to game settings > Account > orange "Connect" button.
Now select a connection method. You can choose one of the following connection methods:
- Email. Enter your email address in the input field. Now check your email. You will receive a confirmation code that you will need to enter in the game.
 - Google account. After clicking, a web page will open. Now you need to log in to your Google account.
 - Apple account. After clicking, a web page will open. Now you need to log in to your Apple account.
 
MUST READ! After selecting a connection method, be sure to click the "Continue" button in the game! Otherwise, your progress will not be connected to Nekki ID.
That's it, your main progress is now successfully connected to Nekki ID.
Now launch Shadow Fight 4: Arena on your new device to which you want to transfer your main game progress.
Go to game settings > Account and click the orange "Connect" button.
Now you need to select the same connection method that you used earlier on the device with your main progress. And follow the same procedure to log into your account.
MUST READ! After selecting a connection method, be sure to click the "Continue" button in the game! Otherwise, your progress will not be connected to Nekki ID.