Here's how to switch your 2FA from your old device to your new device. Note that this process only works if you have access to both devices at the time that you make the switch:

1. Login to your Ndax account.
2. Navigate to Settings ---> Two-Factor Authentication.
3. Click the green 'Recover' button.
4. Enter the 2FA code as it appears on your old device.
5. Your 2FA QR Code and Key will pop up. Scan the code or enter the key on your 2FA app on your new device. 

All done! Your 2FA will now be active on both your old and new devices. You can safely delete the 2FA app from your old device if necessary.