[D-fendr]

Can anything change anything else, without itself changing its changeless state?

IF it was changeless, it would, therefore, not change, else it wasn't really in a changeless state.

In more general terms in the argument, the first cause is independent (in all senses of the word); everything we know in the universe is dependent - it requires something else in order to come into existence.

[kosta50]

IF it was changeless, it would, therefore, not change, else it wasn't really in a changeless state

If it is not changeless than it's not eternal.

In more general terms in the argument, the first cause is independent (in all senses of the word); everything we know in the universe is dependent

That's a hypothetical, free wiling assumption to "balance out" the equation. That's no different than a cosmologist saying there is "dark matter", there has to be, even though we don't know what it is or how to recognize it! But we need it to balance out our equation!

Guess what? maybe the equation is flawed!