How to remount /system - 8.1 imx8m

[fensy]

how to remount the system  partitions？

> adb remount
dm_verity is enabled on the vendor 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 / failed: Permission denied
remount failed

>adb disable-verity
Device is locked. Please unlock the device first

> mount -o rw,remount /system
mount: '/system' not in /proc/mounts

>adb shell 'su mount -o rw,remount /system'
su: failed to exec -o: Permission denied

Any command will not remount.

how to remount...?

[diegoadrian]

Hello,

To remount the system, Please use the below adb commands.

adb devices

adb root

adb disable-verity

adb reboot  (Wait until the reboot finishes)

adb root 

adb remount

After those commands, your system should be remounted successfully.

Best regards,

Diego.

[fensy]

adb disable-verity is not worked.

> adb devices

> adb root

> adb disable-verity

 Device is locked. Please unlock the device first

> adb reboot  (Wait until the reboot finishes)

> adb root 

> adb remount

dm_verity is enabled on the vendor 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 / failed: Permission denied
remount failed

> adb disable-verity

 Device is locked. Please unlock the device first

it's same..

[diegoadrian]

Hello,

Do you know what is your build type for your Android image? To know these, please use the bellow shell command.

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

Your Android image needs to be in userdebug mode. Otherwise, it won't be possible to remount the system partitions.

Best Regards,

Diego. 

[fensy]

Hello.  thank you for your reply.

my build type is userdebug 

> cat /system/build.prop | grep build.type
   ro.build.type=userdebug

T.T 

but adb disable-verity is not work...

[diegoadrian]

Hello,

Are you using a custom build image? Or the image that you are using, is one of our demo images? 

Best regards,

Diego.

[fensy]

Finally I solved.

1. Unlock the device.

  a. Boot up the device.

  b. Choose Settings -> Developer Options -> OEM Unlocking to enable OEM unlocking.

  c. Enter Fastboot mode on the device. Execute the following command on the target side:

      reboot bootloader

  d. Unlock the device. Execute the following command on the host side:
      fastboot oem unlock

  e. Wait until the unlock process is complete.

2. Disable DM-verity.

  a. Boot up the device.

  b. Disable the DM-verity feature. Execute the following command on the host side:
      adb root

      adb disable-verity

      adb reboot

[diegoadrian]

Hello,

Thank you for share your solution. This could help future problems.

Best Regards,

Diego.