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mangoose OS installation issue

I am using ESP8266MOD, AI THINKER (ESP12).I am trying to install Mangoose OS but i am getting some error ,the procedure i have followed mentioned here.
1. Connect CP2101 to USB port ( it detect as COM3)
2.Download mangoose software from (
3.Open cmd prompt change directory to where I have kept mos exe
6.Press GPIO0 button , then press Rest button release reset button then release GPIO0 button
7. Type oms (windows command prompt)

Mangoose OS installer :
1. Connect device , select COM3
3. setup wifi

Setup wifi am getting error :
Error error connecting to the device via serial://COM3: Access is denied.

please help me to come out of this issue. Please guide me follow correct procedure


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