So i had Updated using Custom IPSW but then tried Blackra1n and got to DFU mode then screen went Black...but not off blackra1n says done but wait for reboot its been 10 minutes now, whats the problem?
Once you update to use Blackra1n, you will overwrite the old JB and UL. Blackra1n & Blacksn0w will JB and UL your phone.
Or, as you were informed, you can get a custom restore IPSW for your phone off the internet, then use iTunes to install it. Then Ultrasn0w to unlock again
You have 2 options, no need to sigh and you are not stuck.