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Question: Prohibited sign issue after OS update on macbook pro late 2011

I have a macbook pro late 2011 witb seirra. I got an update installation notification. Clicked on update, mac restarts and update installation in progress suddenly it gives me prohibited sign on the screen. Now i have tried restarting it but getting same error. I dont have a back up of my files. It would be great to get a solution wherein I can save my files as well.

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I solved this by reinstalling the OS and my data was not lost. I used recovery mode to install.

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User profile for user: Shal.Dhaka

Question: Prohibited sign issue after OS update on macbook pro late 2011