i did restoring after dwnldng the new version of W10 technical preview. but when i did so after a 2sec of showinf a running wheel and suddenly shows the smiley sad my phone is lumia525
well, have the same prob.
The Windows Device Recovery tool doesn?t work.
Holding the quiet / on key to start the phone bring the Microsoft startscreen to the screen. It looks like the phone is in an endless loop.
Think I have to send the phne back.
Greetings Wolfgang