My Moto G (1st gen) XT1031 Boost Mobile's Bootloader is 0x4113. How do I upgrade it?

I really hate how the Boost devices are way behind others. Upon researching Google and this website for days, it seems that the Boost variant Moto G doesn't have a proper Lollipop rom for working data besides certain Meticulus builds. I'm trying to test out other roms, but most of them give me a 0x4113 error. The AIO Falcon Bootloader upgrader doesn't work either since it only supports other models except the XT1028/XT1031.

My question is how do I upgrade the bootloader? If it isn't possible, then my other question is, what's the latest, best rom w/ working data for it? Most of them that I've seen are discontinued.