Android O, failed to mount /system, /dev/block/dm-0 is read only I try to mount /system in Android O to RW using the command mount -o rw,remount /system, and i got this feedback on terminal dev/block/dm-0 is read-only
*Already in adb root

Any idea? Thanks
For debug build, user have to disable-verity at first.

adb root
adb disable-verity
adb reboot
adb remount
adb shell
mount -o rw,remount /system


In order to know build type of your android, in adb shell enter the following command

cat /system/build.prop | grep build.type