The display became smaller after my phone dropped into water. How can I fix it?

Hello,
I accidentally dropped my smartphone (Huawei P8) into water. I dried it and it started working again so I thought that everything went well, but today it stopped working. I mean, when I restart the phone, it correctly displays the intro sequence (I can't turn it off, just restart it) but then it shows a smaller version of the unlock screen in the right top corner of the display, and it doesn't answer to my touch, but it still receive messages and e-mail (since it vibrates and shows the light). I have at least to recover the information in the phone if there's a way to do it!
Can anyone help me?
I also tried to put it in the rice for a day but it's still in the same situation!

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