Lg g pad at&t 7.0 stuck on loading screen

A few months ago I rooted my LG G Pad 7.0 AT&T via Kingroot and I did not like it and I wanted to switch onto supersu and a few days ago I tried to switch to Supersu via supersume. After the process I was asked to reboot my device and than I rebooted my device and from then my device wo'nt do anything after the at&t logo appears on the screen and the logo spins a bit and than stucks and nothing happpens than. I do not want to hard reset bcz I have very important data in it. Help!

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