Question: how to transfer all data from one lg to another?
Answer: Before proceeding, both devices must have LG Backup installed. ... 
Tap LG Backup.
If prompted, read the Terms of Use for LG apps. ... 
Tap Receive data.
Tap a type of device for the old phone.
Tap Receive data wirelessly.
On the old device, open LG Backup (Sender).