Using some specialized programs it is possible to transfer and restore older Whatsapp backup (*.db) and then use the chat backup function to generate a new backup, which uses CRYPT8 format. You could get a CRYPT7 with this method as well, but latest version of Whatsapp uses CRYPT8.
Convert WhatsApp Messenger message database to WhatsApp Messenger encrypted message database backup file.
We have found 2 software records in our database eligible for .db to .crypt6 file format conversion.
Blackberry mobile phones and devices software - convert db to crypt6 on Blackberry
WhatsApp is a cross-platform smartphone messenger available for BlackBerry and 4 other major handsets. WhatsApp Messenger utilizes your existing internet data plan to help you stay in touch with friends, colleagues and family.
Convert from db file
to crypt6 file
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned db to crypt6. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Windows Phone / Windows 10 Mobile software - convert db to crypt6 on Windows Phone
WhatsApp Messenger is a smartphone messenger available for Windows Phone, Android, BlackBerry, iPhone, and Nokia phones. WhatsApp uses your 3G or WiFi (when available) to message with friends and family.