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how to change Google account on Android without hard reset: Delete accounts.db file

If the Android device already rooted, then you can delete Gmail Account without factory reset in the following way:

Install the file manager application that can access the root system (the root explorer), for example “File Expert”.

1. Find and open the “data” folder”
2. Find and open the “system” folder which is inside the data folder
3. Find the “accounts.db” file > delete the file
4. Restart your Android phone or tablet

If you use File Expert application, here is more detailed instruction:

1. Install the “File Expert” app from the Android Market
2. Open the Application
3. Press the MENU button > click More > click Settings > File Explorer Settings > tick on “Root Explorer” > it will show superuser pop up notification > click “allow”
4. Press the Back button > you will be taken to the folder list
5. Usually, when you first enter the File Expert app, you’ll be on the SD Card folder. Take a look at the top left side of the application, if your current position is in SD card, it will be written /mnt/sdcard.
6. Press the BACK button so you won’t be in any folder (written “/” on the top left side)
7. Find and click the “data” folder
8. Once inside the data folder, locate and click the “system” folder (it will be written “/data/system”, look picture below)
9. Find the “accounts.db” file > click and hold for several second > click “File Operations” > Click Delete > Click Confirm

Go to "/data/system" folder then delete "accounts.db" file

I have tried this method  and it is safe to do. Some Android users who already tried this method never face a problem. But still, do this with your own risk. 

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