to recover whatsapp messages i factory reset my phone and then installed whatsapp.Before that i had created a backup of my conversations in my sd card,the name of the backup was 'msgstore.db.crypt'.After i installed whatsapp and after entering my number,i got a option to restore my conversations.i clicked'restore'.it loaded for a minute then i had to enter my name and other things.After i finished everything no conversations were retreived.i hav the backup in 'databases' folder...but its not working!!what should i do????..pls help me out!i need those messages.
If you're absolutely sure there is indeed a file with messages in /sdcard/WhatsApp/Databases and WhatsApp cannot restore it, here's what you need to do. I faced this problem multiple times when restoring messages.

Before doing anything make sure you create a backup of the WhatsApp folder somewhere on your computer in case something goes wrong.

First, I assume that if you had the latest WhatsApp version before you made the factory reset, the database file's name will end in .crypt5 You'll need an app from the Play Store: https://play.google.com/store/apps/details?id=org.fireblade.whatsappconverter Make sure you download it with the Google account you used to download WhatsApp before the reset (if you have more than one). The database file is encrypted with the Google account's username so you cannot decrypt database from somebody else. Press Convert crypt5 to crypt database

Now the database name should end in crypt. You'll need this tool: http://forum.xda-developers.com/showthread.php?t=1583021

Follow the instructions exactly. I've used it multiple times and it works. Place the .crypt file in the folder, install Python (step 4) and then run whatsapp_xtract_android_crypted.bat. If the browser opens up, then everything went fine. Close it and find the database file ending in .db in the folder.

Next, copy this file to the Databases folder on your SD card and delete everything else in this folder (you have a backup, right?). Detach your phone from the computer and try to install WhatsApp again. This time it should successfully recognize the database file and restore you messages.

Good luck!