How to retrieve deleted WhatsApp messages: Simply uninstall and reinstall WhatsApp. When you reinstall the app, you will be prompted to restore your message history from the backup file. Select Restore and everything from the latest backup will be restored.
However, if the WhatsApp account is deleted entirely after deleting all chat backups first, then there is very little scope to retrieve anything as even if a new WhatsApp account is created with the same phone number, it is as good as new.
FoneDog Toolkit- Android Data Recovery will now scan the entire Android device so it may actually take a while before the scanning is completed. Once done scanning, you can now see all the deleted WhatsApp messages onscreen.
Recover via local storage
This method however is applicable only for Android users and does not work on iOS. Open the file browser on your device. Go to WhatsApp > Database. The database contains all the WhatsApp backup files that are stored locally.
can police recover deleted pictures, texts, and files from a phone? The answer is yes---by using special tools, they can find data that hasn't been overwritten yet. However, by using encryption methods, you can ensure your data is kept private, even after deletion
Can we get Whatsapp chat history legally?
Yes, authenticated copy of whatsapp message is valid in court if the same is supplied by the service provider. Only on direction of court or police in a pending investigation the service provider can provide with such details.
However please remember that he has to have the original device for recovering the chat history.