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#4335
"Press and hold Volume Up button + Power Key"
Auzután hangerőgombot kell valamerr vagy fel vagy le nyomni, de keress rá :)
Vagy találtam ilyet:
If your Nokia wouldn’t boot up, or if it failed booting up. I remember doing this three hand salute hard reset ,Well, if your Nokia Lumia 800 is not turning on or fails to boot up, you can try performing a button hard reset on your Lumia 800. It will erase everything, but it will hopefully save the phone. Here’s how to do it:
The phone should be off. Hold in this order and at the same time the volume down, camera and power buttons.
Keep holding the keys for another 5 seconds after you get some kind of response.
You are done, hopefully your Lumia is booting up by now.