According to Osho, freedom is choiceless awareness in which the egoic chooser disappears, and then let-go happens by itself—the recognition that existence already flows this way. Let-go and surrender are not actions but realizations; once they happen, the fight ends and self dissolves. Surrender removes hindrances; it flowers into freedom, while in true freedom one naturally relaxes into let-go.
When you stop trying to control life with your ego, you notice it already flows; relaxing into that flow is letting go, and that reveals real freedom.