Check the following:
- Make sure you are writing on an XNote dot-pattern notebook (not regular paper).
- Hold the pen so the optical sensor faces downwards at a natural angle (−20° to +40°).
- Do not cover the optical sensor with your fingers.
- Avoid writing in direct sunlight.
- Do not write on the edge of the page where there is no dot code.
Check if the optical sensor is clean — if dirty, wipe with a soft cloth. If the LED shows a pink solid light with alarms, there is an optical sensor issue. See Section 1.5 for details.