[HELP] Moto G 2013 GPE Stuck at boot after update

Hello,

I updated my Moto G 2013 to GPE 5.1 a while ago using an install guide from this forum (it was non-gpe before). Today I got a notifcation that an update is available. I installed it and now my phone won't fully boot up. So I am stuck in this boot animation.
What can I do now? I also want to backup at least my files on the sd card. Or is there any way to fix my problem while preserving my data?

Thanks a lot