Yes you have a legit version and you can update to any firmware , and yes you can update also to the finless bob 2.1 , i recomand you the 720p kernel its more powerfull !
*No you cant use the usb to power the device , if you have less than 2A under load the device will reset or turning off .
*If you have bad wifi signal check the signal pins under the mobo.
Have a nice day !
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