How to solve the Touchpad problem of ELAN 1200?

As you said in the V12 release, "ELAN 1200 FIXED". I am very excited to see this because I have been troubled by this problem for many days. Then I use your clover file in the V12 release, and I really fix my touchpad problem. So excited!!! And thank you very much!
But I really want to know how you solve this problem. Could you please help me out？Thanks again!!!