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Where in the phone filesystem are settings saved? I've lost my ADB backup password and simply want to delete it. If it affects other settings that won't matter too much.

I will be interfacing the filesystem through a root shell.

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In my stock Android 4.2.1 the file responsible for holding Desktop backup password seems to be /data/backup/pwhash.

I took a backup of it, renamed it, restarted the device, and the password was reset to empty. Now I could create a new password from the Settings easily.

In CM12, I had to rename two files, namely pwhash and pwversion, and everything went well after a reboot.

Note: I noticed file modification in /data/<FOLDERS> to proceed and ultimately reach my conclusion, which of course works here.

  • As for most of the settings, /data/data/com.android.providers.settings/databases/settings.db contains the stuff. – Firelord Jul 2 '15 at 19:55
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This worked for me on Moto X Play (6.0.1), stock ROM, unrooted and may be of use to others

I wanted to remove the password set earlier for a different reason

In USB configuration, I entered the previous password, in Enter your current full backup password and left blank in both Enter a new password for full backup here and Re-enter your new full backup password here and clicked on Set Backup Password and it accepted it meaning that I didn't have a backup password now !

I verified this running Helium chrome extension which requires backup password to be blank and it worked

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