Why is my phone showing an unknown symbol?

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Windows Central Question

My Phone Is Showing An Unknown Symbol

My phone was working pretty well until about a day ago. I was turning it on and the it turne off for about five minutes and started showing a symbol I havent seen before. Because of this I cant do anything wihh my phone (nokia lumia 520). It just shows this is symbol until the batteries dies.

Its a large lighting bolt and then next to it is a smaller wheel (like the settings logo)

Does anyone have any clue what this is and how to fix the problem because I'm getting desperate at this stage
 

MDK22

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Oct 17, 2013
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Re: My Phone Is Showing An Unknown Symbol

YES, perform a HARD RESET

This can be done via a (side)key combination / sequence which will revert the device to factory. ALL data will be lost.

Search the web for 'Lumia 520 Service Manual' ... @ the very end of the manual, there is the key combo / sequence to initiate a hard / factory reset. I have the key combo for my Lumia 1520 (& the Lumia 920) but both have non-removable batteries - the key combo for yours could be different.
 
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