The only way to transfer your game progress from one iOS or Android device to another is to have previously connected your game to your Google account or Apple Sign In.
If you have linked your Knight account to either Google or Apple Sign In, and are trying to retrieve your progress on a second device, follow these steps:
1. Install Knighthood on the second device.
2. On the first screen, select the Sign In option at the bottom.
3. Your new device should now have access to your Knight.
Please note that you can only have your game open on one device at a time.