Test the pen pressure in other paint software.
It has pen pressure:
You need to set pen pressure sensitivity in the paint software setting manually/the current version of your frequent-used paint software isn’t compatible with Parblo Island A609.
No pen pressure:
Find "Pen Setting" in the "Tablet Setting"(Win)/ "Normal Setting"(Mac), use the pen drawing in the right area to test pen pressure.
If it has pen pressure, it means the driver installed successfully. If not, please reinstall the driver.