1 ubuntu adb devices下出现

$adb devies
no permissions (user in plugdev group; are your udev rules wrong?); 

解决方法如下：

sudo usermod -aG plugdev $LOGNAME
adb kill-server
sudo adb usb

2 使用fastboot烧录 system.img

sudo mv fastboot /sbin/ 
adb reboot bootloader [enter fastboot mode]
sudo fastboot flash boot boot.img
sudo fastboot -S 100M flash system system.img
sudo fastboot reboot