Have you tried using a humid hide at all? That might be a good solution for you in the future.

For now, I would give him a good long soak. Maybe even a few hours to really loosen things up. Then it should be easy to roll the skin off. The snake probably won't like it, so try to be quick.

One layer of stuck shed doesn't concern me too much, but when the next shed also goes bad, its time to take some action.