[Solved] Syntax Error and corrupted Notebook recovery

Questions
,
1

I have a quite large (850MB) and valuable notebook which is corrupted all of the sudden. Is there any possible way I could try to fix it?

ScreenShot2020-09-10at9.51.15AM.jpg
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Thanks a lot!

2

As our powerful and always helpful Jesse Friedman pointed out:
How do I repair corrupted notebooks using the AuthorTools package?

It works for me! Thanks Jesse!