How to restore apps after factory reset finished?
Have you tried this solution?


From any home screen, tap Apps.
Tap Settings.
If using Tab view, tap Menu > List view.
Scroll to DEVICE and then tap Backup &amp; reset.
Under LG BACKUP, tap Restore from backup.
Locate and tap the backup.
Tap Start to begin the restore. This may take several minutes.
After the restore completes, tap Done.
The phone reboots to complete the restore.


(Source)