You can try GT Recovery for Windows!
non-root !
Many people are asking for how to recover deleted
WhatsApp messages.
It's very important for us to get those conversations back with out backup
whatsapp if mistakenly they can deleted.
Some common situations that lost Whatsapp msg you can recover from:
1. accidentally deleted it on your android phone
2. lost
messages after Android 5.0 updated or other Android upgrade.
3. save
messages from water damaged, crashed, broken or smashed Android phone
4. Android deleted
messages randomly by itself
5. Factory restore Android phone.
And more...
Twitter:https://twitter.com/GtRecoveryapp
Google+:https://plus.google.com/communities/109657948177651590858
Download link:
http://www.gtrecovery.net/