Hi, I found this [https://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_repair/how-to-unbrick-a-lumia-520-in-dead-black-screen-or/d2966734-a54a-49dd-856c-a4be0c4dd525|microsoft answers forum post] that deals with this issue, it seems rather drawn out, unappealing process but seems to work.
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Hi, I found this [https://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_repair/how-to-unbrick-a-lumia-520-in-dead-black-screen-or/d2966734-a54a-49dd-856c-a4be0c4dd525|microsoft answers forum post] that deals with this issue, it seems like a rather drawn out, unappealing process but seems to work.
Hi, I found this [https://answers.microsoft.com/en-us/insider/forum/insider_wintp-insider_repair/how-to-unbrick-a-lumia-520-in-dead-black-screen-or/d2966734-a54a-49dd-856c-a4be0c4dd525|microsoft answers forum post] that deals with this issue, it seems rather drawn out, unappealing process but seems to work.
Let me know if this helps.