It might actually be difficult for you to revive a bankrupt business because you still need to invest so much and even if you are doing this you may not even be sure if the business will be profitable or not.A bankrupt business doesn't mean the end of such business. If I am opportune to revive such business given the required tools and resources needed to operate, I would look at the success story of the competitors and also capitalize on the loopholes of such companies to pooi successful moves.