On XP's update instructions it says...Note: The HF coils function only with version 4.0 & 4.1. Does this mean if I update to 5.2 I can't use my HF coil?
If you do update to 5.2 it will update your remote and wireless headphone module only. Your coil won’t be recognized during update process (on your computer screen) since it needs no update.
You can still use your Hf coil.