Exporting the paid world from the marketplace (purchased)

I would like to clarify: the world is bought, with huge buildings (which I made myself), which are a pity to lose. The difficulty was earlier, because of which the world did not start stably. I had to reinstall the phone, the world itself was saved on the hard drive, after reinstalling the device, the world starts up broken. I promise you to give me access to launch the world,for me it is very valuable