Open the handsfree pack with a nail cutter ore screw driver.

Step 1: Desoldering the Wires, Take Care Wire Colors

Now desoldering the attached wires with the help of soldering iron.

Step 2: Soldering the Wires Respectively

Soldered the wires again and take care of colors.

Finally repack the handsfree cover and place a little glue to joint it.

Now handsfree is ready to use...!!!