If the body fat scale box is lost, but there is a QR code, you can scan the QR code by the following steps:

1. Open the sports application, connect Bluetooth, and select Bind weighing scale.

2. Download a program and connect the phone according to the prompt.

3. If the body fat scale has a QR code, you can search again.

Please note that different body fat scales may have different operating methods. You can get more help according to the instructions of a specific scale, or contact the manufacturer of the scale.