Do you formerly deleted WhatsApp messages , message or loose due to any system error due to reset your phone? Well, do not worry , you can still recover them.
For the safer side , WhatsApp ( default ) saves all your conversations on SD card. Go to the WhatsApp SD >> card >> Database . Here
msgstore.db.crypt contains all the message sent / received today and
the files of this type in the format yyyy - MSGSTORE .. dd .. db.crypt contains all WhatsApp messages sent in the last seven days.
Simply open these files with a simple text editor , you can read / see all messages.