Can't boot oneplus nord after installing magisk

I just rooted my phone using magisk. everything went fine until flashing the img. After doing so, when I try to boot, the phone tries to boot forever. I followed a tutorial, don't know if I'm allowed to link the exact guide. It seems like this websites tutorials aren't the best, so it may be smarter to follow something else? Anyway, has anyone got a clue what's going on?