What do you mean delete the recent update? The APK file? I already have and redownloaded with the same issue. If I uninstall the game and install the new APK it will work but the save data will be lost. How do I backup and load the save data?! And what does creating a dumb file mean?
If you dont wanna play from beginning You should move your file data save(android>nijukozo.com) move it to everywhere(to picture,or etch) and uninstall older version and install new version..but old version save data can't use for this new version..bcs dev add messenger fiture..so sadly you should play from beginning like me..