If you previously signed in with your Apple ID. 
Please use Apple ID to log in first. Once inside, you can link your Google account or Email in settings. This ensures you can use any of the three methods to log in on any device next time.

What should I do if my new device shows "already bound by another user"?

We are very sorry for the inconvenience you have encountered.

To help us resolve this swiftly, please provide the following information:

The SN (Serial Number) shown on the App screen where it displays the message "Your device is already bound by another user".

Your purchase receipt/information (such as your order number or a screenshot of the order details showing the order number).

Once we receive these details, we will help you reset and unbind the device promptly. Thank you for your patience!

How to request device unbinding for second-hand or older devices?

To protect user privacy and data security, we must verify physical possession of the product before we can unbind the device from the previous account.

Please provide the following details for our team to verify ownership:

The SN (Serial Number) shown on the App screen when you see the message "Your device is already bound by another user".

A clear photo of the original outer packaging box, specifically showing the barcode and the Serial Number label on the back.

Once we receive this visual confirmation, we will process the unbinding for you as quickly as possible. Please reply directly to this email with the required photos.