在 Android 5.1.1 执行 remount system failed 解决方法

shanshanx@shanshanx:~$ adb root
adbd is already running as root

shanshanx@shanshanx:~$ adb remount
dm_verity is enabled on the system partition.
Use "adb disable-verity" to disable verity.
If you do not, remount may succeed, however, you will still not be able to write to these volumes.
remount of system failed: Read-only file system
remount failed

方法一：
1.adb disable-verity and than adb reboot( may be not work sometimes)

方法二：
2.device/xx/baytrail/xx/fstab
/dev/block/by-name/android_system       /system         ext4    ro                                         wait,verify  

删除 verify 标识；

方法三：

让 adb 默认 打开root 权限，

修改 ramdisk里的 ro.secure=0