It is one of the DIY options with the greatest chance of success, well worth a try.
Nokia Software Recovery Tool
Use the Nokia Software Recovery Toolto recover your
phone if you have software or software update problems. If your phone is
not responding, it appears to be stuck or is not starting you can try
to recover it at home before initiating a repair.
**Link updated 9/21/2016
Windows for home | Other | Devices and drivers
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Anonymous
2015-01-13T14:21:09+00:00 I have suddenly got a blue screen and a white sad face on my 520! Would the Nokia software tool sortbthis problem out??
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Anonymous
2014-12-28T07:56:57+00:00 Cant open Lumia Software Recovery tool..
It shows this error..:(
Please help..:(