Change state of checkbox in listview with custom adapter from code

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Android

checkbox

ListView

I have a listview in main activity with a custom adapter class which has a text view and a checkbox in it. I can get the checked items from the code but when I set uncheck all the checkboxes from the code, it wouldn't change on the Android device LCD. Their states are unchecked from the code but still checked on the LCD!

What I have tried:

Below code is what I have tried for unchecking the checkboxes, their states are changed but nothing is changed on the LCD.

for (int i = 0; i < ((CustomAdapter) LstExt.getAdapter()).getCount(); i++) {
                    View v = ((CustomAdapter)LstExt.getAdapter()).getView(i, null, LstExt);

                    ItemHolder b = (ItemHolder) v.getTag();
                    b.chkSelect.setChecked(false);
                    CheckBox cb = v.findViewById(R.id.Chk);
                    cb.setChecked(false);

                }