below there is a short instruction to use on own risks:
1. Check that an USB cable is powered from USB port. Connect it to USB port without connecting 6-pin connector.
If it works, continue.
2. Using a sewing needle pull a plastic spring up (1-2 mm) and take off the wire. Repeat with all wires. Do it easily, do not apply any hard force!
3. Connect TXD, RXD and GND to the plastic holder as needed. Before this you may directly connect wires to the board to check. Do not connect other wires (just isolate them). Remember that usually TXD of the cable is connected to RXD of the board. And vice versa.
4. Check the cable.