In PE, just make a creative world (if you have full version) Name it something you'll remember, like Ghost Town, then get into it, then exit it. On my phone, it has Think Free Office, if you have that, just go in after downloading the Chunks.dat file, and find in your games folder your Ghost Town world and delete it's Chunks.dat file (I do this first, to keep from getting confused) then just go to downloads folder and either copy or move this new Chunks.dat file to that Ghost Town folder. Then go into the game and enter and there you go.
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"You signed a document to have the earth destroyed?!" "I thought they wanted an autograph!" Yeah, it happens to all of us, sometimes.