There’s literally no way for you to bypass the block if you’re affected.
Its incredibly scary, I once had a bad useragent (without knowing it) and half the internet went offline, I couldn’t even access documentation or my email providers site, and there was no contact information or debugging information to help me resolve it: just a big middle finger for half the internet.
I haven’t had issues with any sites using Anubis (yet), but I suspect there are ways to verify that you’re a human if your browser fails the automatic check at least.