Made several attempts at a factory reset without success.
All began with my home button not working, had to continually back page till I reached my home screen.
Tried a battery removal approach to solving that problem ended up with entire phone not rebooting.
All I get from an attempted factory reset is a return to a triangle with an explanation point and a droid icon.
I've read of people way back in 2011 having the same problem! I would think there would be a fix.