What I mean is this: The law that came 430 years later does not revoke the covenant previously established by God, so as to nullify the promise.
KJV
And this I say, [that] the covenant, that was confirmed before of God in Christ, the law, which was four hundred and thirty years after, cannot disannul, that it should make the promise of none effect.
ASV
Now this I say: A covenant confirmed beforehand by God, the law, which came four hundred and thirty years after, doth not disannul, so as to make the promise of none effect.