Originally Posted by rmurray1975
This is the state I got the phone in. I had taken a quick check on the internet to see how to resolve the issue, and thought it would be worth the cost of the phone (40 Euros) to try to fix it myself. Guess I was wrong!
I'm not sure whether this can help, but try mate.
1) Enter download mode and install stock rom using ODIN (preferred)
If this doesn't do the trick, try another EXPERIMENTAL alternative way,
2) Enter download mode, root your device using CF root using ODIN, flash a custom recovery using ODIN, boot into your custom recovery, flash a custom rom (risky)
I never encountered this before so I have no idea whether this can actually help or not, so do this at your own risk.