U50&U20 reset factory

            1.reset whole system,step as follow
            a.turn off device
            b.press the reset button and turn on the device,release the reset button after about 6-8s) until the sys led goes off 
            c.wait about 8mintues,system will bootup again smoothly if it is correct

            2.reset only application 

            a.device is on working status,and blinking once per second
            b.press Reset button about 6s-8s,then relese and it will recovery application,
            but usually we didnt use this ,and prefer to reset from GUI
            Updated: 30 May 2016 01:35 AM
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