Lakzian's Euclidean diffeomorphism conjecture for Berwald spaces

Let $(M,F)$ be a geodesically complete Berwald space with non-negative flag curvature and large volume growth.

Lakzian's conjecture. The space $M$ is diffeomorphic to Euclidean space $\mathbb{R}^{n}$.

This conjecture concerns the topology of non-negatively curved Berwald spaces under a large-volume-growth assumption. The supplied text gives no evidence that it has been resolved.