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Replace the touchpad
If you have tried everything else and it didn't work, the only thing left for you to do is to replace the touchpad. It is not a simple procedure and you should be very careful because the computer components are easily fragile. Buy an original touchpad assembly, which you can find in authorized stores.
If you are willing to take the risk, watch this video (which is applicable to all laptops) before you try to replace the touchpad: