First I'd like to let you know that my phone is Android 6.0 Marshmallow. So it works on the latest Android OS, no need to worry.
As we know that the reason why we could not backup App data is “permission”. Take Naver LINE latest version 5.10.1 for example, the allow:Backup permission is false so Android abd backup could not get the database file – naver_line.
Of course we got other options to deal with this situation. I’ve introduced you guys how to flash Recovery ROM and Root to get full control. Now let’s focus on how to backup App data without rooting the phone. Before proceeding, do bind e-mail or FB account first in Naver LINE so that data will be safer.
The secret is “Install older version of that App” so that we could use Android backup to get the DB files of that App. How it works? Let me show you:
“Adb install –r “ means reinstall the App and keeps data. That’s it. Now you got my point,right?
After installing the older version of LINE, remembert not to run LINE on the phone...Now we could got the .ab file and convert .ab into .tar file. Finally we could see the content of naver_line and know suspects chat messages.
How about the phone? Just use Google Play to update to the latest version of LINE and you'll see all the data still there.