How to recover lost data in Iphone during upgrading?

I lost my data during upgrading. My little cousin accidentally took out the USB out of the computer while I'm upgrading. What is the easiest way to recover and I don't even know if I PRESS BACK UP before that. I don't know if it's still possible but I'm hoping.

I have the some trouble with you. I found the a best iPhone data recovery tool on the internet. Share the download link for you, hope it can help for you.
http://www.ipadsofts.net/download/ios-data-recovery.exe

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