Follow the Steps -:
1) First Backup of your Whatsapp Messages
2) Then download Next android app named Tri Crypt. This android app decrypt whatsapp crypt 5 format to readable .db(database) format.
3) Open Tri Crypt Android app and Click on decrypt whatsapp messages.
4) Now download Sqlite Editor android app for reading whatsapp .db file.
5) Open Sqlite Editor android app go to Files. Here we have file and directories. We find msgstore.db file in these directories.
6) Now follow this path in Files ******find sdcard folder <
7) Now read all the whatsapp messages in Android Phone.
8) You can read other Whatspp user data when you get his msgstore.db file.