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Edited by melanrz at 2016-11-2 20:50
If your board dont boot and you want check is DOA (dead on arrival) use this tutorial.Instal ubuntu img and go with guide.
What you need:
-Hardware serial converter ftdi
-Software Arduino sdk or serial monitor
Set voltage on serial conventer to 3v!!!!
Connection:

opi<=>serial
Gnd<=>Gnd
Rx<=>Tx
Tx<=>Rx
Serial monitor proper output and baud rate:

Video how its work.
https://www.youtube.com/watch?v=8upT2NymUzg
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