1. Turn off the video conference system and disconnect the power supply.
2. Open the equipment shell.
3. Find the microphone slot and pull out the old handheld microphone.
4. Insert the new handheld microphone into the slot and make sure that the plug is fully inserted.
5. Reconnect the power supply and turn on the video conference system.
6. Test whether the new handheld microphone works normally.
Please note that replacing a handheld microphone may require some professional skills and tools. If you are not sure how to operate, please contact Huawei customer service or professional technicians for help.