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Cannot boot into Fedora 25 while upgrading to 26

Hello guys, I make myself into deep trouble.

I have installed Fedora 25 and a few hours ago I upgraded to 26 by following the instructions provided by Fedora magazine: https://fedoramagazine.org/upgrading-fedora-25-fedora-26/

However when I first rebooted the systemd showed an error message like "cannot get freq at ep 0x...". I thought my system would hang so I rebooted my PC again. After that, every time I try to boot into the Fedora 25 kernel and all I get is just a screen with 3 white square bubbles, and the screen stops just right there.

Now I have a Fedora 25 netinstall CD and a 26 Live DVD. Where do I start to rescue my Fedora? Thank you guys for any help.