There are two general situations that can cause LG WhatsApp chat message loss:
Situation 1. Accidental deletion
This can be the most common case. It occurs when users delete a useless message or clean the chat to speed their LG phone.
Situation 2. WhatsApp crash
When this happens to your device and after you reinstall the app, you may not restore WhatsApp data because they can be overwritten. In this case, if you want to recover the deleted WhatsApp chat history from LG G6/G5/G4/G3/L30/V20, make use of the backup if you have any. But, there is actually an easier way for this. No matter you have a backup file or not, FonePaw Android Data Recovery can help. By scanning the deleted chat history, your data can be found again.
Find WhatsApp History Back from LG G6/G5/G4/G3
Step 1. Connect Your LG to PC
Simply use a USB cable for this. You need to launch FonePaw Android Data Recovery first. And then get the wire plugged into the computer. If this is the first time you connect the phone with it, drivers will be installed.
Step 2. Turn USB Debugging on
To allow the PC getting access to your data one the handset, you'll have to enable USB Debugging. Click the link to learn more, or follow what the interface says. Basically, users of Android 4.2 or newer version need to go to "Settings" > "About" > Tap "Build number" for 7 times > "Settings" > "Developer options" > Tick "USB Debugging".
Step 3. Scan for Deleted Chat History
After this, choose the types you want to get back - tick "WhatsApp". You can also tick "WhatsApp Attachments" and other kinds. But, it should be noted that more types means more time. If you don't need them, simply check the exact item. And then, tap on "Next" at the lower right corner. Allow the Superuser request if any comes up. It is to give rights to PC for the file scanning part.
Step 4. Preview and Recover the Text
It shouldn't be long before the process ends. You'll then see the final interface. Click "WhatsApp" and the details will be listed on the right side. Make use of the switch "Only display the deleted item(s)" if necessary. Finally, click "Recover".
Done! All messages are restored. Open the chat and you can reach the message you want.