Sync your current account with Facebook in the game.
On B device;
Make sure that a different Facebook account is not registered on,
- Facebook App
- Browsers (Chrome, Safari, Firefox, Opera, etc.)
- Settings> Accounts section of the device.
Log in with your Facebook account synced to your A account from your selected Browser (Chrome, Safari, Firefox, Opera, etc.) on device B.
Install the game on B device and complete the tutorial.
On the main screen, tap on FRIENDS button.
Tap on Connect button.
Tap on the "Confirm" button to choose the account you want to play.
Choose "Confirm" from the pop-up window.
Now you can play your old account on device B.
WARNING: Please select the correct Head Ball 2 account, there is no way to recover your previous account.