So, I've tried jailbreaking it - didn't work, others tried and failed too. Some of them were lucky and did it. So I made a poll, about it.
I don't know if I should keep trying or give up.
I did exactly that. Restored from the 7.1 B2 ipsw off iTunes. I applied the JB and it would leave me stuck on a endless loop. 7.0.4 works fine.Did you OTA to beta 2? If so, that's probably why. Try restoring to beta 2 and then jailbreak. I did that and mine works fine.