If you revamp something, you renovate or remake it. You'll have to revamp your vacation plans if the hotel where you were planning to stay has closed for repairs and renovations.
The vamp of a shoe or boot is the front part that covers the top of the foot. If that part of your shoe needed repair or replacement, then you would have to revamp it. From this sense, we get the more common meaning of revamp — to restore or fix up. Your favorite hotel might be trying to revamp its image, to reinvent its reputation as a family resort.