I soft bricked my LG Leon LTE (LGMS345) and it's been stuck in a boot loop. I was able to get it into download mode. I tried different methods on this site to unbrick with no success until I un-installed the LG Mobile Support Tool. Restarted windows (running 8.1) and re-installed the LG Mobile Support Tool. While in download mode the tool recognized my device and I clicked on Update Recovery, I was so sure it wouldn't work, but it did! I spent a very frustrating two days watching my new phone loop. I hope this helps someone.
Edit - After re-installing LG Mobile Support Tool I changed the COM Port from 4 to 20
Edit - After re-installing LG Mobile Support Tool I changed the COM Port from 4 to 20
Last edited: