Android - Enable ADB from recovery

Android - Enable ADB from recovery.md

Android - Enable ADB from recovery

Credits to @TheOnlyAnil-@Firelord¹

• Requirements: a) stock recovery + rooted phone b) custom recovery

• Files changed:

  • /system/build.prop
  • /data/property/persist.sys.usb.config
  • /data/misc/adb/adb_keys

Enable ADB (1/2): enable USB debugging

same as "Settings >> Developer Opcions >> USB debugging" ON

• Connect the device to Mac or PC in recovery mode.
• Now open terminal/CMD in computer and go to platform-tools/. type and enter adb devices to check if the device is connected in recovery mode.
• Now type adb shell mount data and adb shell mount system to mount the respective directories.
• Get the persist.sys.usb.config file in your system using adb pull /data/property/persist.sys.usb.config /Your directory
• Now open that file in a texteditor and edit it to mtp,adb and save.
• Now push the file back in the device; adb push /your-directory/persist.sys.usb.config /data/property
• Get the build.prop file; adb pull /system/build.prop /your-directory
• Add these lines:

persist.service.adb.enable=1                                                    
persist.service.debuggable=1
persist.sys.usb.config=mtp,adb

• Push build.prop back into the device; adb push /your-dir/build.prop /system/

Fast way

adb shell
mount data
echo -n 'mtp,adb' > /data/property/persist.sys.usb.config

Verify options are not present before do it: adb shell "grep 'persist.service.adb.enable' /system/build.prop"

adb shell
mount system
echo '' >> /system/build.prop
echo '# Enable ADB' >> /system/build.prop
echo 'persist.service.adb.enable=1' >> /system/build.prop 
echo 'persist.service.debuggable=1' >> /system/build.prop
echo 'persist.sys.usb.config=mtp,adb' >> /system/build.prop 

Enable ADB (2/2): RSA verification

For the RSA verification that you asked to bypass, I don't know whether it would work in your device, but it worked in my little experiment. In Lollipop, the ADB keys (after authorization) are saved in /data/misc/adb/adb_keys. Your private key is saved in computer. In Linux the directory location is $HOME/.android/. On Windows that usually translates to %USERPROFILE%.android, but keys might end up in C:\Windows\System32\config\systemprofile.android in some cases.

adb push ~/.android/adbkey.pub /data/misc/adb/adb_keys

Bibliography

Footnotes

1. http://android.stackexchange.com/questions/120394/can-i-enable-usb-debugging-using-adb ↩

I create Magisk Module for this, check this out. https://github.com/lexavey/Adb-Root-Enabler

Hi guys, I am on lineageos 9. I managed to get usb debugging enabled through twrp, but I can't seem to bypass the RSA verification even though I have copied the key as mentioned above. Unfortunately, I don't have magisk installed, but is there a way to install the unauthorized adb manually through twrp?

Edit build prop, need command twrp mount /system
Pull adb public key to data/misc/adb
And this
echo "1" > /data/property/persist.service.adb.enable
echo "1" > /data/property/persist.service.debuggable
echo "mtp,adb" > /data/property/persist.sys.usb.config

To generate adbkey.pub from adbkey file

(base) ➜ pwd
/home/xyx/.android
(base) ➜ adb pubkey adbkey > adbkey.pub
(base) ➜ adb push adbkey.pub /data/misc/adb/adb_keys

Hello everyone, I have successfully implemented it on the Xiaomi 8 Dipper（lineageos 21 ）. The main steps are as follows,
in twrp ：
mount /system_root

adb pull /system_root/system/build.prop build.prop

`
persist.service.adb.enable=1

persist.service.debuggable=1

persist.sys.usb.config=adb

ro.adb.secure=0
`

adb push build.prop /system_root/system/build.prop

mount /vendor
adb pull /vendor/etc/fstab.qcom fstab.qcom

移除fstab.qcom中的加密配置fileencryption=ice,
adb push fstab.qcom /vendor/etc/fstab.qcom
`
reboot

If your system is readonly, need magisk and service.d to run prop value