So lets try this and see if it helps.
Hard Reset using buttons:
Press and hold the Camera + Volume Down + Power until the phone vibrates. Then release the Power key and keep pressing the Camera + Volume Down for a few seconds.
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My Nokia Lumia 920 shows the lightning bolt and gear icon. does not start and is frozen on that icon.
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So lets try this and see if it helps.
Hard Reset using buttons:
Press and hold the Camera + Volume Down + Power until the phone vibrates. Then release the Power key and keep pressing the Camera + Volume Down for a few seconds.
A HAD SAME PROBLEM TOOK OUT MEMORY CARD ATTACHED TO LAPTOP AND PRESSED VOLUME <DOWN> AND POWER BUTTON AND IT CAME ON
i tried this but i unable to find the solution
when i tried this my phone is keep on restarting but no progress towards reset
I tried almost every possible combination that are provided by u n many more but its not working for m
i dont even getting exclamation mark on my phone screen.
all this happend when i was tried to upgrade mu phone to wondows10 preview from 8.1
i have nokia lumia 520
plz help m out
thanking u
One key point is buried in one of the answers: TAKE OUT THE MEMORY CARD before doing any resets/upgrades.
thanks man it worked
however my volume up key is stucked m using lumia 620 any trick to solve that
Glad that helped.
Not sure why the volume rocker is stuck. I might try blowing it with air just in case it is something like dust or link that inadvertently got in there and is causing the issue.