Ok, the last thing that maybe will help you..
1. Go to first post and press on "my clean backup"
2. When you will see on the black screen "completed", press Done.
3. Open FileBox app and go to: /home/user/MyDocs/.downloads
4. Double click on the file named: N9QTweakBackup_5.4_all.zip
5. Press on the button "Extract files" and this will open for you new window with: Arrow up, extract here, cancel.
6. press once on arrow up, this will open for you new window in /home/user/MyDocs directory.
7. Press "Extract here" and this will open new window with question: "Override all", press on this.
8. When process is completed, close FileBox app.
9. Open N9 QTweak app, when you see tweak menu, press Z, then enter. This will ask for restoring, press 1, then enter. When process is completed press R, then enter. Now you phone will reboot.
10. check your conversation app.

Done...