I only had unit one day.  I set the wifi up and charged unit as battery was low.  I switched unit off before going to bed but kept unit charging.  In the morning the light was green indicating batery was full.  But I could not turn unt on no matter how long I pressed the on switch. I tried pressing the reset button on the red light came on whilst the reset button volume + pressed.  The screen did not come on at all.  c

I did some research and found the RK flash tool.  This only showed blue square and not green square as specified and then came up with error message unit failed to start.   I've seen questions about blue square on flash tool, but no other message appears to match my error message. I tried the reset and volume but the blue square remained

Does anyone know if this is software or hardware problem?  Any solutions