There may be something in the alternate fastboot mode. You can boot into it from the bootloader, which appears to come unlocked on this model.
I've been trying to run fastboot binaries over OTG but my LG isn't rootable and I don't have a PC. I know some ZTE devices had an adb flag to disable write protection from some of those gov't phone providers.
I think the alternate fastboot is called like ffdm or something like that.