>adb devices
List of devices attached
emulator-5554 device
???????????? no permissions
which means this device is unknown to adb yet.
try to find it is device id
>lsusb
Bus 001 Device 006: ID 19d2:0287 ONDA Communication S.p.A.
19d2 is the vendor id, 0287 is the product id.
>sudo /etc/udev/rules.d/51-android.rules
add a new entry at the end with vendor/product id above
>sudo restart udev
>adb kill-server
>adb start-server
>adb devices
List of devices attached
emulator-5554 device
04507242439fb497_MTPADB device
