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Is it possible to make a zip file, similar to the one that installs GApps, that stores ADB debug mode as a system setting? Maybe somehow modify a system bootup script to change the ADB debug mode setting to on? I'm setting up a testing environment, and I can't have a factory reset turn off ADB.

update: I think I've almost got it - I have a rooted deice using CWM recovery, and I am using SuperSU for root permission management. I unpacked the .zip that the CWM installs su from, and added a modified /system/build.prop to the update, as well as a command to turn on adb in /data/data/com.android.providers.settings/databases/settings.db using sqlite3, but I think it require root access, and SuperSU has default access to su set to 'prompt'. Is there a way I can modify it to be 'grant' by default?

useful links: https://stackoverflow.com/questions/13326806/enable-usb-debugging-through-clockworkmod-with-adb

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For those who are looking for an answer to this question: you can enable adb from a zip file that you install through recovery. I modified Superuser.zip from http://download.chainfire.eu/351/SuperSU/UPDATE-SuperSU-v1.65.zip What I did was I modified system/build.prop and added persist.service.adb.enable=1 at the bottom, I also added ro.setupwizard.mode=DISABLED to disable the setup wizard which gets annoying if you wipe or flash often. Then I added a precompiled sqlite3 (don't have a link, I got it from my company's repo) to system/bin and the line sqlite3 /data/data/com.android.providers.settings/databases/settings.db "UPDATE global SET value=1 WHERE name='adb_enabled'" to system/etc/install-recovery.sh (although some people say modifying settings.db is optional.)

Unfortunately it seems adb still requires you to accept the rsa certificate until you unpack boot.img and modify /default.prop

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