I am trying to upgrade android os 6.0 to 8.1, but my machine wouldn't be
recognized while pressing reset button and inserting usb cable..
my mars display the "No command" when I pressing the reset key while inserting usb. then went into "Recovery Mode" always..
I changed usb cable .. and attempt to do it in another computer , but it still doesn't work .
is it problem with my mars? or another things to do recognize the device in computer?
