1. adb root
//adbd is already running as root
2. adb disable-verity
using overlayfs for /vendor
Verity disabled on /vendor
using overlayfs for /
Verity disabled on /
Now reboot your device for settings to take effect
3. adb reboot
//设备重启
4. adb root
//重新以root身份运行adb
5. adb remount
可以成功remount /system为读写模式