My Lumia 620 is running Windows 10, and last night it said updates were available. I started the update, then suddenly the phone turned off, and it only shows the NOKIA logo. It's been this way for 15 hours already. What should I do?
Revert back to windows phone 8.1 using Device recovery and than update again. This happens while phone is updating and it turn off due to battery. Make sure battery is full when you update your phone