Download iBackup Viewer for free (WINDOWS/MAC).

First of all make sure to have a recent unencrypted iTunes backup, like explained here. Now you just need to transfer ChatStorage.sqlite to your Android device in the WazzapMigrator folder.

 

ChatStorage.sqlite extraction on Mac - Step 1
ChatStorage.sqlite extraction on Mac - Step 2
iBackup Viewer - ChatStorage.sqlite extraction
iBackup Viewer - Media extraction