The MetroPCS LG leon MS345 recently received a new software update bring the device to software version ms34510j.
The Update is available via FOTA and LG Bridge. If you want to install the update manually, you can grab the Lg leon MS345 STOCK KDZ firmware from below link
You can also use this kdz firmware to restore/unbrick your LG MS345 if you have ever bricked your LG Leon MS345.
To restore your LG LEon ms345, First please download the firmware from above link.
and then You need TO INSTALL
LG USB drivers
LG UP software
LG UP DLL for LG MS345
Learn how to unbrick/Restore Your Phone with LG UP, Follow our guide here..