Ipython notebook: 400 bad request

Hi, I had a Ipython notebook called "oldName" but since I renamed it with "% oldName" I can not open it anymore and the following error appears "'400 bad request". I can not rename it because I can not enter in it and I have an important script inside of it, so it would really be a waste of time if I lost the job I have done on it. Any idea on how to get the script back ?

Thank's

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