I can't use Kies if it won't boot up. And as far as i can see i can't root it without being unlocked and i can't unlock it without being rooted.
I hadn't upgraded it earlier because of the Kies driver requirement, which doesn't work on Linux. I do have access to a Windows laptop currently though...
I tried to use Kies from Download Mode, which i managed to get into a few days ago, but it doesn't do it now. Not sure if i'm doing the wrong combination or what.