Android P(9.0) userdebug版本执行adb remount失败

[DESCRIPTION]
     在android P版本上如果按照“FAQ18076 android 6.0 M userdebug版本执行adb remount失败”的做法在userdebug版本上执行adb remount会提示以下错误:
remount of the / superblock failed: Permission denied
remount failed
     原因是android P版本后google启用avb(Android Verified Boot)2.0,verified boot and DM-verity默认启用策略发生了变化。详情如下:
DM-Verity behavior changes from vboot1.0 to avb2.0.
On vboot1.0, dm-verity is turned off on eng build and is enabled on userdebug/user build.
DM-verity could be disabled with adb (not fastboot) on userdebug build without unlocking device first.
DM-Verity could not be disabled on user build.
On avb2.0, dm-verity behavior are the same on all build variants.
It’s turned on by default and could only be disabled after device is unlocked.
dm-verity disable flag is moved from system image dm-verity metadata(vboot1.0) to vbmeta image(avb2.0), and you have two ways to disable it: adb and fastboot.
  

[SOLUTION]
* Android P + kernel-4.4 or kernel-3.18
– download preloader with verified boot disabled which location is the same as scatter file //preloader_<PROJECT>_SBOOT_DIS.bin
– adb root
– adb disable-verity
– adb reboot
– adb root
– adb remount

* Android P + kernel-4.9 or after
– download preloader with verified boot disabled which location is the same as scatter file. //preloader_<PROJECT>_SBOOT_DIS.bin
– boot to Home Screen
– go to setting -> system -> Developer options -> OEM unlocking
– adb reboot bootloader
– fastboot flashing unlock
– press volume up key
– fastboot reboot
– adb root
– adb disable-verity
– adb reboot
– adb root
– adb remount

After Android P, preloader_<PROJECT>_SBOOT_DIS.bin will be generated automatically after building preloader.
* 请注意下载最新的adb/fastboot tool
Windows
https://dl.google.com/android/repository/platform-tools-latest-windows.zip
Mac
https://dl.google.com/android/repository/platform-tools-latest-darwin.zip
Linux
https://dl.google.com/android/repository/platform-tools-latest-linux.zip

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作者: RESSRC

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《Android P(9.0) userdebug版本执行adb remount失败》有一个想法

  1. 你好,我的MTK 机子,执行 fastboot flashing unlock 的时候,音量+ 按键不工作,只有音量- 工作,该怎么办啊?

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