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LINE is a chat application.

I recently reinstalled my OS, and restored my LINE chat history using this procedure.

Problem: Some of my chats appear like this:

enter image description here

It says:

Letter Sealing
Unable to display message as it couldn't be decrypted. Please ask your friend to resend the message.

As you can see, my friend re-sending me the message does not solve the problem.

On the messages from July 6 to the day I reinstalled have this problem.

So I disabled Letter Sealing, and now I can read new messages sent to me (but I can still not read the existing problematic messages).

Questions:

  • How to make the problematic messages readable again? I still have the Titanium Backup from the former OS, if necessary.
  • Is there a way to re-enable Letter Sealing while making sure that encrypted messages will stay readable even after reinstalling my OS in the future?
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Had the same problem. The second method on this page worked for me.

Steps:

  1. Do a previous backup
  2. copy /data/data/jp.naver.line.android/databases/naver_line to your PC and rename it to naver_line_old
  3. Reinstall and do a fresh setup of LINE
  4. copy the new naver_line to your PC and rename it to naver_line_new
  5. In your PC, open and copy the chat_history table from naver_line_old(I used SQLiteStudio) and paste it on naver_line_new, having previously deleted chat_history from it
  6. copy naver_line_new to /data/data/jp.naver.line.android/databases/naver_line(rename it as naver_line)
  7. Restart your phone

Letter sealing should work OK now; unfortunately, I don't know how to make the problematic messages readable again.

I hope to have solved your problem.

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