The disassembly of Xiaomi Bluetooth Headset Line Free requires certain skills and tools. It is recommended to operate under the guidance of experienced or professional people. The following are the general steps:

1. Use a knife or a plastic piece or other tool to gently insert it into the charging port and pry open the casing.

2. After removing the casing, you can see the internal circuit board, battery and other components.

3. Use flat-nose pliers to grasp the plug on the cable and pull it out upwards.

4. Separate the two earphones: Use flat-nose pliers to clamp the plug on the connecting cable and pull it out upwards to separate the left and right earphones.

5. If deeper disassembly is required, further disassembly of internal components is required, taking care to avoid damaging key components.

Please note that before performing any repair, modification or disassembly operation, please make sure that all connections between the equipment and the power supply are disconnected, and be cautious about operations that may involve risks and hazards.