that's funny... I was struggling with this issue for more than 2 hours, nothing worked. I've posted here and few seconds later BOOM - I've managed to get rid of these *****ty blue boxes. Sorry, but I can't even tell what exactly was the trigger which turned it off, all i did is pressing and releasing the power button + volume up + home button, all three together, for about 20 times (overall it took around 5 seconds) and Voila - phone is unlocked and back to life :-) Karma is a *****
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