It's the cable and/or the usb power supply/port!, use a genuine 2.0a/2.4a usb cable(one that came with your phone) and plug the cable directly into a pc(not a hub!)usb 3.0 ports usually work better than 2.0 or a genuine cell phone charger rated at 2.0a/2.4a, low voltage, hubs etc can cause issues, I changed my cable and tried other ports and everything worked fine, I also thought mine was broke!
Posts made by Mike Anthony
RE: OLED does not display
RE: Will not boot
@fossette I just got the serial to work, I tried forcing the new firmware, and even downgrading, and then re-updating both via web and serial, the light contines to blink, it never stops, the web interface goes down after 5 mins and back to the pic above, passwords/wifi passwords never stick on either the broken or working device