Using the Accessibility library, when creating the accessibility object, the only way it works is to spell it "accessiblity" <-- notice the missing "i".
In v8.80 BETA #2, using the mis-spelled type ("Accessiblity") results in a compiler error - so there is no backward compatibility.
error: cannot find symbol
anywheresoftware.b4a.objects.Accessibility.Accessibility2 _access = null;
^
symbol: class Accessibility2
location: class Accessibility